Substances will expand or contract ______ heated or cooled, but this is not the case with water.


  1. A.
    when they will be
  2. B.
    if they will be
  3. C.
    as they being
  4. D.
    when
練習冊系列答案
相關(guān)習題

科目：高中英語 來源：2013屆遼寧錦州錦州中學高三第四次模擬考試英語卷（帶解析） 題型：閱讀理解

It was your birthday, and you just opened your biggest gift — a smooth silver laptop. You can’t wait to instant-message your friends with the news, but first you have to get rid of your old desktop computer. Do you just throw away the monitor and keyboard in the trash? Not anymore!
Three states, that is, California, Maine, and Maryland, recently passed laws prohibiting people from throwing away electronic waste, or e-waste, includes televisions, computers, and cell phones. Although they don’t make you sick when you use them, they do when they are destroyed, for they contain heavy metals that can be harmful to human bodies. For example, cell phone batteries contain a kind of chemical causing damage to kidneys and deserted computer monitors can damage brains. And flat TV screens may cause injury to the nervous system. Those metals can leak into the ground or give off pollutants when burned.
It is required that e-waste be placed at special sites rather than usual landfills. Several other states are considering similar laws and California is also pushing for a law banning the application of such dangerous substances.
Government officials are not the only people taking aim at e-waste; environmentalists are also urging people to recycle their outdated equipment.
“It is just a waste … to not recycle,” Patrick, an associate professor of occupational and environmental health at university of Iowa, told The Daily Iowan, “Allowing dangerous chemicals to leak into the environment for decades seems irresponsible.”
What Can You Do?
Reduce. Be a responsible shopper, and take care of your electronics so they will last longer.
Re-use. Donate or sell your old high-tech equipment.
Recycle. To find a responsible recycler, contact a local or state environmental group.
【小題1】What’s the best title of this passage?

A．E-waste is being made good use of.
B．E-waste, a big threat to us.
C．E-waste is dangerous to us all the while.
D．Goodbye, e-waste.
【小題2】Why is e-waste harmful and dangerous to human beings?
A．Because they can go off at times and threaten us.
B．Because they can make people sick, as long as people use them.
C．Because they contain poisonous chemical substances.
D．Because they take too much space when placed in trashes.
【小題3】What can we know from Patrick’s words?
A．Waste can’t be recycled.
B．Waste can be made use of by recycling
C．We have to recycle e-waste to protect the environment.
D．Protecting the environment is important.
【小題4】Which of the following is NOT given as a piece of advice to help with e-wastes?
A．Taking care of your electronics so they will last longer.
B．Donating or selling your old high-tech equipment.
C．Contacting a local or state environmental group.
D．Asking fewer people to use electric products.

查看答案和解析>>

科目：高中英語 來源：2013-2014學年山東省山師附中高三11月期中學分認定考試英語試卷（解析版） 題型：閱讀理解

As rain begins to fall from the clouds, it is very pure. However, as it falls through the air it dissolves some of the gases in the air ,It also collects bits of dust and microbes(微生物)that are floating in the air, When the rain reaches the ground it begins to pick up more dust and dirt, Many kinds of mineral substances dissolve in the water ,Sand and nud cannot dissolve in water.

Since water is so important to us, it is very important that the water we use should be clean , Otherwise, we might get some of the diseases that are carried by water Many microbes are harmful ,They are so small that we cannot see them ,These microbes must be removed or killed before the water is not clean, people who drink this water may get these diseases, Thus , to provide people with clean water, the government purifies the water.

Purification is a long process and consists of three stages: storing ,purifying and distributing ,The first stage is storing , Man-made lakes called reservoirs are used for this purpose ,Water from the rains ,other lakes, streams and rivers is collected in the reservoirs ,This water is usually dirty and muddy.

In the second stage shich is purifying , water from the reservoirs is filtered in a special pond, Stones, sand and other unwanted tiny things are caught in it, After that, tiny microbes are still present in the water ,These microbes are removed by “airing ”the water and by adding a chemical substance called chloring(氯)to the water ,This kills all the microbes in the water ,A fter this the water can be safely used for drinking.

The third stage is the distribution of the purified water to homes ,hospitals, offices ,factories and other places, This is done through a network of pipes of various sizes, These pipes must be make of a suitable material.

1.From Paragraph 1, we can learn that           

A、Rain has contained gases when it forms in the clouds

B、Dust and microbes are dissolved in rain when rain falls on the ground

C、The closer rain is to the ground, the more impure things it contains

D、Sand and mud are things rain collects when it falls through the air

2.According to Paragraph 2 ,the following statements are wrong except that        

A、All the microbes in water are harmful so water must be purified

B、some diseases can spread through drinking water if it is not clean

C、Water is safe to drink if only harmful microbes are removed from it

D、it is the govrnment’s responsibility to make drinking water clean

3.What can we know about man-made lakes?

A、It is used through the whole process of purification

B、Only rain water can be collected and stored in it

C、Water collected can be stored and filtered in it

D、Water from them contains a lot of impure substances

4.What is the function of the chemical substance chlorine?

A、to air the water            B、to catch tiny things

C、to kill microbes             D、to remove harmful gases

5.What is probably this passage?

A、A news report     B、A book review     C、A magazine article       D、A school paper

 

查看答案和解析>>

科目：高中英語 來源：2014屆遼寧朝陽柳城高級中學高二上學期期末考試英語試卷（解析版） 題型：閱讀理解

根據(jù)短文內(nèi)容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。

Do you constantly use the computer, whether for learning or entertainment? Computers give off radiation(輻射) that is bad for your health, but here are some ways to protect yourself from computer radiation.

__1___Green tea can be absorbed by the body easily into a form of vitamin A, which helps reduce radiation.__2__

It is advisable to attach a radiation filter plate(輻射過濾板)in front of your computer’s screen. Make sure to avoid putting any mental substances near your computer as these may have reflected some of the electromagnetic waves that are harmful to your health. __3__ The brighter the screen the higher the radiation there will be and vice versa.

You can also put some radiation-absorbing plants such as several cacti near your computer to prevent radiation.

Make sure you do a skincare protection before sitting in front of the computer .

___4__Wash your face soon after using the computer in order to reduce 70% of the radiation.

__ 5___ Old computer in general, has one to two times more radiation released than the new one within the same distance.

A．And adjust the brightness of your computer screen.

B．Apply a layer of facial mask to protect yourself.

C．And adjust the sound level on your computer.

D．The most efficient way is by drinking some coffee regularly.

E.The simple way is by drinking 2 or 3 cups of green tea every day.

F.If possible, purchase a new computer instead of using an old model computer.

G.It also helps keep our eyes see things clearly in the dark by improving the visual ability.

 

查看答案和解析>>

科目：高中英語 來源：2012-2013學年陜西省高三第七次模擬考試英語試卷（解析版） 題型：閱讀理解

根據(jù)短文內(nèi)容，從下框的A-F選項中選出能概括每一段主題的最佳選項。選項中有一項為多余項。

A. Live below your means

B. Always stay positive

C. Educate yourself

D. Work towards a dream

E. Developing lasting personal relationships

F. Stay in shape

1.____________

We all want to buy that new piece of technology, treat ourselves to an expensive dinner, or take out a loan for the car we can't afford. It might feel great at the time but hasty（匆忙的）spending hurts a lot later on. Enjoy life's simple pleasures and save as much as you can. Expensive things don't create lasting happiness. Careful spending will bring you greater enjoyment in the long run.

2._____________

To be happy we need continuous growth. The best way to grow is life-long education. This doesn't mean you need to pursue a doctorate or spend 2 hours reading every day. Self-education can be anything that takes you out of your comfort zone. The important part is keeping an open mind and searching for fresh ideas.

3.____________

Suppose you had everything you wanted. Would you be happy without anyone to share it with? The personal relationships we develop with friends and family members are the greatest source of happiness in our lives. Don't forget about them. Taking the time to develop and enjoy personal relationships is important to long-term happiness.

4._____________                          

Even if your life isn't perfect, you can always build toward a goal. The best way to do this is working towards a goal. We can’t control everything about our lives, but working towards a goal gives us something positive to focus on and lays the foundation for future success. No matter what your passion is, get out there and start doing something.

5._____________

You only get one body. Once it is ruined, there isn't much you can do about it. Exercise to keep the body working well. Avoid eating too much of damaging substances and unhealthy foods. It may feel terrible at the time but enjoying good health in your later years is worth the sacrifice. 

 

查看答案和解析>>

科目：高中英語 來源：2012-2013學年貴州省高三上學期期末考試英語試卷（解析版） 題型：閱讀理解

At least 10 million hectares of cultivated（耕作）land in China are polluted, which makes a grave threat to the country’s food safety, the Xinhua News Agency reported on Friday.

The polluted land，which is mostly in economically developed areas，accounts for one-tenth of the country’s total arable（可耕種的）land，according to an incomplete survey by the State Environmental Protection Administration，China’s top environment watchdog.

Pollution on cultivated land threatens the environment，food safety and the sustainable development of agriculture，the administration said.

Because of continual，too much use of chemical fertilizer, pesticide and agricultural plastic sheeting, as well as irrigation using polluted water, a large amount of contaminants（污染物）remain in the cultivated land.

The contaminants affect the soil’s ecological structure and function，leading to decreased soil productivity, lower crop yield（產(chǎn)量），and lower quality of agricultural products-

It also leads to worse water quality in rural areas.

Less than 9 per cent of drinkable water passed checks for bacteria in243 rural water supply stations across the county.

Another survey, which took samples of drinking water and groundwater an 69 small towns。 in Beijing, Tianjin and Hebei Province of North，China, showed that more than half of the water contains too much nitrate（硝酸鹽），which may cause diabetes（糖尿�。゛nd damage the kidney.

The administration estimated at least 1 90 million farmers are drinking water that contains harmful substances.

Many villagers drink unfiltered water taken from shallow water wells or water cellars， which are reported to have poor sanitary conditions·

1.The author writes the passage to            .

A．1et the readers examine their mistakes

B．present the readers a new idea

C．come up with a solution to ending farmland pollution

D．inform the readers of the importance of fighting farmland pollution

2.The underlined word “grave” in Paragraph 1 probably means

A．serious           B．certain            C．big               D．terrible

3.Pollution on cultivated land leads to the following outcomes EXCEPT       .

A．a(chǎn) threat to China’s food safety

B．worse water quality in rural areas

C．a(chǎn) variety of diseases

D．the sustainable development of agriculture

 

查看答案和解析>>

同步練習冊答案