14.Could smells affect your lifespan?Female fruit flies(果蠅) without the ability to smell food live longer than other fruit flies.The sense of smell may be connected to the cellular ageing (細(xì)胞老化) process in many other living things-even people.Such connection has recently been found in both worms and flies.For example,scientists found that removing fruit flies'ability to smell made them live nearly 20percent longer than flies with a sense of smell.
They confirmed that food smells were the ones most likely to affect ageing,as nutrition and lifespan are known to be connected in many living things.To test the idea that food smells affect lifespan,they removed flies'ability to smell carbon dioxide,which is produced by some fly foods.They left the rest of the smelling system intact.
This action had no effect on male flies,but the females lived 30percent longer than normal.Removing the ability to smell CO2 may stop flies getting information about food availability.This could mean that food is not enough,causing processes that encourage flies to survive.Scientists found that the female flies stored extra fat and that both males and females immune(免疫) to CO2were stronger against the stress than normal flies.It is suggested that females may simply be easily influenced by the smells of CO2
Scientists point out that people don't know whether ageing and smell are connected in animals and humans.But they clearly experience physical changes after smelling food.

21.From the passage,we learn that what scientists found is toC
A.show there is the best way to make lifespan longer
B.tell us we should remove our smell ability to live long
C.show the sense of smell can affect the cellular ageing process
D.explain fruit flies without ability to smell can live longer
22.Scientists do some researches to proveD
A.the immune system of flies to CO2
B.the connections between nutrition and lifespan
C.the importance of food smells to our humans
D.the connections between food smells and lifespan
23.According to scientists'opinion,we can see thatB
A.male flies in general can live longer than female ones
B.flies without ability to smell is encouraged to store extra energy
C.both male and female flies can live longer without the ability to smell
D.flies without ability to smell can also get information about food availability
24.Which of the following best describes the passage as a whole?B
A.CO2 has few effects on female flies.
B.The sense of smell might have an effect on living things.
C.The sense of smell is necessary to humans'health.
D.Female fruit flies can always live longer than male flies.

分析 主要介紹了氣味是否會(huì)影響你的壽命,科學(xué)家通過(guò)在果蠅身上的實(shí)驗(yàn),指出,人們不知道是否老化和嗅覺(jué)在動(dòng)物和人類(lèi)之間的連接.但他們清楚地體驗(yàn)了聞食物后的身體變化.

解答 21.C.細(xì)節(jié)理解題.根據(jù)The sense of smell may be connected to the cellular ageing (細(xì)胞老化) process in many other living things-even people.可知,科學(xué)家發(fā)現(xiàn)嗅覺(jué)能影響細(xì)胞老化的過(guò)程.答案是C.
22.D.細(xì)節(jié)理解題.根據(jù)Could smells affect your lifespan?可知,科學(xué)家做了許多研究去證明食物的氣味和壽命之間的聯(lián)系.答案是D.
23.B.細(xì)節(jié)理解題.根據(jù)Scientists found that the female flies stored extra fat科學(xué)家發(fā)現(xiàn)雌性果蠅存儲(chǔ)多余脂肪,可知答案是B.
24.B.細(xì)節(jié)理解題.根據(jù)文章內(nèi)容可知,對(duì)這篇文章描述最完整的是"嗅覺(jué)可以影響生物".答案是B.

點(diǎn)評(píng) 本文是科教類(lèi)閱讀理解.做這類(lèi)題材閱讀理解時(shí)要求考生對(duì)文章通讀一遍,做題時(shí)結(jié)合原文和題目有針對(duì)性的找出相關(guān)語(yǔ)句進(jìn)行仔細(xì)分析,結(jié)合選項(xiàng)選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測(cè),一定要做到有理有據(jù)

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:高中英語(yǔ) 來(lái)源: 題型:填空題

7.Though Van Gogh had little financial success during his lifetime and often lived inpoverty,his fame grewdramatically after his death.
雖然Van Gogh一生中沒(méi)有多少經(jīng)濟(jì)回報(bào)且常常生活在貧困中,但他在去世以后聲譽(yù)鵲起.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:填空題

8.有一天晚上,我熬到11點(diǎn)半故意不睡覺(jué),為的是獨(dú)自好好看看月亮.
One evening I stayed awakeonpurposeuntil half past eleven in order to have a good look at the moon by myself.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:書(shū)面表達(dá)

2.It was my birthday last year.Every year,my parents prepared abirthday giftfor me.So that day I was expecting a birthday gift,too.After I came back from school,I sawmy motherwatching TV in the sitting room.
"Mom,where is my birthday gift?"I asked.Hearin g that,my mother looked up at me.She looked surprised.Then she said,"Sorry,I totally forgot it's your birthda y today.I haven't got a birthday gift for you."I was very sadto hear that.I went to my room and shut the door.
About half an hour later,my mother came and knocked on the door.She told me supper was ready.
"Come out to eat quickly,"she said as if nothing had happened.After I went out,I saw my mother and father sitting at the table.I came to the table,unhappy.
"So how is everything going in school?"while eating,my father asked.
"Nothing special,"I said in a low voice.
   After supper,my father said,"Let's go out and enjoy a ride."
   I wasn't in a good mood,so I said,"I don't feel like going anywhere."
   My father smiled and said,"Follow me.You won't get disappointed."
   Looking at the smile on my father's face,I suddenly cheered up.I was sure my parents had prepared a surprise for me.So I followed.
   Then we went out of the house and got onmy father's car.I thought they were taking me to the downtown area to get a birthday gift or watch a show at a theater.
However,after a while,I realized we were not heading to the downtown area.Instead,we were going in the opposite direction.I became very curious.About half an hour later,my father stopped the car on a farm.The owner of the farm came out to greet us.The air was sweet and warm.There were many goats there.The farmer's daughter gave me a baby goatto hold.I suddenly knew it was my birthday gift.
注意:
1.所續(xù)寫(xiě)短文的詞數(shù)應(yīng)為150詞左右;
2.應(yīng)使用5個(gè)以上短文中標(biāo)有下劃線的關(guān)鍵詞語(yǔ);
3.續(xù)寫(xiě)部分分為兩段,每段的開(kāi)頭語(yǔ)已為你寫(xiě)好;
4.續(xù)寫(xiě)完成后,請(qǐng)用下劃線標(biāo)出你所使用的關(guān)鍵詞語(yǔ).
Paragraph 1:
The other day,while I was reading a book,I looked at a picture of a baby goat.      .
Paragraph 2:
I held the baby goat in my arms and touched it.      .

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:書(shū)面表達(dá)

9.寫(xiě)作內(nèi)容:(字?jǐn)?shù)100左右)
1.許多孩子都喜歡邊聽(tīng)音樂(lè)邊學(xué)習(xí),家長(zhǎng)認(rèn)為這樣不利于學(xué)習(xí).
2.一個(gè)美國(guó)科學(xué)家的實(shí)驗(yàn),肯定了家長(zhǎng)這一觀點(diǎn).
3.認(rèn)為學(xué)習(xí)時(shí)聽(tīng)音樂(lè),同學(xué)們?nèi)菀资芤魳?lè)節(jié)奏或歌詞的影響而分心;
4.一些快節(jié)奏的歌,特別是搖滾樂(lè),令人興奮,對(duì)學(xué)習(xí)狀態(tài)不利.
5.你自己的觀點(diǎn)呢?
參考詞匯:
節(jié)奏:rhythm    分心:distract (v.)/distraction (n.)

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

19.College visits are important.Before you commit years of your life and money to a school,be sure you're choosing a place that is a good match for your personality and interests.You can't get the"feel"of a school from any guidebook,so be sure to visit the campus.Below are a few tips for getting the most out of your college visit.
Explore on Your Own
Of course you should take an official campus tour,but be sure to allow time to hang around on your own.The trained tour guides will show you a school's selling points.But the oldest and prettiest buildings don't give you the entire picture of a college.Try to walk the extra mile and get the complete picture of the campus.
Read the Bulletin Boards
When you visit the student center,academic buildings and residence halls,take a few minutes to read the bulletin boards.They provide an easy way to see what's happening on campus.The ads for lectures,clubs and plays can tell you what's going on outside the classrooms.
Eat in the Dining Hall
You can get a good feel for student life by eating in the dining hall.Try to sit with students if you can.Do the students seem happy or stressed?Also,is the food good?Are there rich healthy options?Many admission offices will give prospective students coupons(優(yōu)惠券) for free meals in the dining hall.
Visit a Class in Your Major
If you know what you want to study,a class visit makes a lot of sense.You'll get to observe other students in your field and see how involved they are in classroom discussion.Try to stay after class for a few minutes and chat with the students to get their impressions of their professors and major.Be sure to call in advance to schedule a classroom visit-most colleges don't allow visitors to drop in on class unannounced.
Talk to Lots of Students
Your campus tour guide has been trained to market the school.Try to talk to students who aren't getting paid to impress you.These important conversations can often provide you with information about college life that isn't part of the admission script.Few university officials will tell you if their students spend all weekend drinking or studying,but a group of random students might.
For more tips,please go to collegeapps.a(chǎn)bout.com.
56.The best way to know about a college in an official campus tour isA.
A.to walk around the campus alone
B.to take pictures of the campus
C.to visit the oldest and prettiest buildings
D.to hire a tour guide
57.Reading the bulletin boards can help youB.
A.decide the major you want to study
B.find out the after-class activities on campus
C.get free coupons from the admission offices
D.find out the options of healthy food
58.If you plan to attend a class on campus,C.
A.drop in on a class in your major
B.have talks with the students in the class
C.make an appointment in advance
D.a(chǎn)sk how the students like their teachers and majors
59.To get a real idea of the college during a visit,it's best to talk toD.
A.famous professors                
B.campus tour guides
C.a(chǎn)dmission officers                   
D.random students
60.Where does the passage probably come from?C
A.A news report.
B.A tourist poster.
C.An educational journal.
D.A geographical magazine.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

6.When you need a job very much,you may end up taking one for which you are over qualified.Although you were initially grateful just to have the work,you now feel bored and depressed.Is there any way to change that?
Start by changing your opinion,says Caitlin Kelly,the author of Malled,a book based on her experience as a sales clerk after losing her job in journalism."Don't focus on what you're not getting but what you are getting,"she says."Be patient and work attentively with a wide range of people.It doesn't matter what the job is-there are always things you can learn and skills you can develop."
Hilary Pearl,the founder of a coaching firm,says,"Tell yourself the current situation isn't the end of your career.Don't overdramatize(過(guò)分夸大)the negative aspects but try to view the situation more philosophically:life has a series of stages,and this is one of them.Don't forget to study even in the worst stage."
Consider that because you're overqualified,you may be able to learn or do things on the job that might not have been possible in a more demanding position,says Sarah Hathorn,the chief executive of Illustra Consulting."You could spend your extra time in learning different aspects of the business and teaching others in the organization,"she says.
Is it possible to make your work more challenging,even if your job responsibilities aren't likely to change?
Of course,you may seek tasks and responsibilities that force you to learn something new or to work harder."You may be operating on autopilot(習(xí)慣性地)right now,but chances are that people above you are stressed,"Sarah Hathorn says."Take things off your boss's plate and let him know which projects or tasks you want to learn more about."
Always express your request positively,saying that you love new challenges,rather than complaining that you're bored and underused,says Ethun,the president of the Park Avenue Group.In your down time,educate yourself about the company and its industry."Read corporate information,analyst reports and related news articles,"she says."If your boss accepts your suggestions,it will make you a more valuable employee."
65.According to Caitlin Kelly,C.
A.one should be willing to do some small things
B.being a salesman is not as important as being a journalist
C.performing your regular duties well is important
D.doing a simple job well will bring you a sense of success
66.What Hilary Pearl intends to express is thatD.
A.work is just a stage of our whole life
B.the present job doesn't matter to us in a long run
C.one should be satisfied with his present situation
D.one should look forward instead of complaining about the present situation
67.The underlined words"take things off your boss's plate"meanB.
A.draw your boss's attention             
B.share your boss's burdens
C.give your boss useful advice        
D.a(chǎn)sk your boss for a better position
68.What is the common view about careers of the people mentioned in this passage?C
A.One should start his career from doing a simple job.
B.One should improve himself and help others as well.
C.One should keep learning new things to improve himself.
D.One should pay much attention to the relationship with the boss.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

3.My heart sank when the man at the immigration(移民)counter gestured to the back room.I was born and raised in America,and this was Miami,where I live,but they weren't quite ready to let me in yet.
"Please wait in here,Ms.Abujaber,"the immigration officer said.My husband,with his very American last name,accompanied me.He was getting used to this.The same thing had happened recently in Canada when I'd flown to Montreal to speak at a book event.That time they held me for 45minutes.Today we were returning from a literary festival in Jamaica,and I was shocked
That I was being sent"in back"once again.
The officer behind the counter called me up and said,"Miss,your name looks like the name of someone who's on our wanted list.We're going to have to check you out with Washington."
"How long will it take?"
"Hard to say…a few minutes,"he said,"We'll call you when we're ready for you."After an hour,Washington still hadn't decided anything about me.
"Isn't this computerized?"I asked at the counter,"Can't you just look me up?"
"Just a few more minutes,"they assured me.
After an hour and a half,I pulled my cell phone out to call the friends I was supposed to meet that evening.An officer rushed over."No phones!"he said,"For all we know you could be calling a terrorist cell and giving them information."
"I'm just a university professor,"I said.My voice came out in a squeak.
"Of course you are.And we take people like you out of here in leg irons every day."
I put my phone away.
My husband and I were getting hungry and tired.Whole families had been brought into the waiting room,and the place was packed with excitable children,exhausted parents,and even a flight attendant.
I wanted to scream,to jump on a chair and shout:"I'm an American citizen; a novelist; I probably teach English literature to your children."
After two hours in detention (扣押),I was approached by one of the officers."You're free to go,"he said.No explanation or apologies.For a moment,neither of us moved.We were still in shock.Then we leaped to our feet.
"Oh,one more thing,"he handed me a tattered photocopy(破爛的復(fù)印件) with an address on it,"If you aren't happy with your treatment,you can write to this agency."
"Will they respond?"I asked.
"I don't know-I don't know of anyone who's ever written to them before."Then he added,"By the way,this will probably keep happening each time you travel internationally."
"What can I do to keep it from happening again?"
He smiled the empty smile we'd seen all day,"Absolutely nothing."
After telling several friends about our ordeal,probably the most frequent advice I've heard in response is to change my name.Twenty years ago,my own graduate school writing professor advised me to write under a pen name so that publishers wouldn't stick me in what he called"the ethnic ghetto"-a separate,secondary shelf in the bookstore.But a name is an integral part of anyone's personal and professional identity-just like the town you're born in and the place where you're raised.
Like my father,I'll keep the name,but my airport experience has given me a whole new perspective on what diversity and tolerance are supposed to mean.I had no idea that being an American would ever be this hard.

66.The author was held at the airport becauseD.
A.she had been held in Montreal               B.she had spoken at a book event
C.she and her husband returned from Jamaica   D.her name was similar to a terrorist's
67.She was not allowed to call her friends becauseA.
A.her identity hadn't been confirmed yet
B.she had been held for only one hour and a half
C.there were other families in the waiting room
D.she couldn't use her own cell phone
68.We learn from the passage that the author wouldB to prevent similar experience from happening again.
A.change her name                B.do nothing
C.write to the agency            D.a(chǎn)void traveling abroad
69.Her experiences indicate that there still existsC in the US.
A.tolerance         B.diversity(差異)  C.discrimination(歧視) D.hatred
70.The author soundsA in the last paragraph.
A.ironic (具有諷刺意味的)  B.impatient     C.worried       D.bitter.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:填空題

4.Scientists have discovered that  (61)staying (stay) in the cold could help us lose weight.Researchers at the University of California found that exposure to the cold increases levels of a protein that helps form brown fat-the type of fat that produces heat and keeps us warm.Brown fat burns energy,(62)which helps us lose weight.White fat stores extra energy,which results (63)in weight gain.The researchers said that because air conditioning and heating give us constant,  (64)comfortable (comfort) temperatures,our body's need for brown fat has decreased.They found that:"Outdoor workers in northern Finland who (65)areexposed (expose) to cold temperature have (66)asignificant amount of brown fat when (67)compared(compare) to same-aged indoor workers."
The research was conducted on two different control groups of mice.(68)One group was injected with the protein that helps create brown fat.This group later gained 30% less weight after both groups were fed high-fat diets.The researchers say this could be good news in the fight against obesity.People who are obese have  (69)lower(low) levels of brown fat than thinner people.Head researcher Hei Sook Sul said:"This protein could become an important target for research into the treatment and prevention of obesity and obesity-related diseases."She added:"If you can somehow increase levels of this protein,you could (70)possibly (possible) lose more weight even if eating the same amount of food."

查看答案和解析>>

同步練習(xí)冊(cè)答案