5．Polar bears are suffering in a （61）warmer （warm） world than ever before．Polar bears live in environments too cold for most animals．（62）For/During much of the year，they live and hunt on the frozen Arctic sea ice．Nature has prepared （63）them for the cold conditions．But nothing has prepared the bears for the danger that （64）threatens  （threat） the only home they know．The polar bears'world is melting．Studies show that the polar ice has reduced by 9.8% every 10years （65）since 1978．Now about 20，000to 25，000polar bears live in the Arctic．Polar bears depend on the sea ice for their （66）survival  （survive）．"The sea ice is more than just this platform that the bears walk over，"says Andrew Derocher，（67）a scientist who studies North American polar bear populations．"（68）Without it，they can't exist．"Some melting and refreezing of the polar ice is natural．（69）But in a warmer world，these cycles speed up，and bears have less time to hunt．Normally，they have three months in the spring when they gain more weight．The extra fat is used later，（70）when the bears are not actively hunting．

分析 本文通過介紹北極熊所適應(yīng)的生存環(huán)境以及由于全球變暖，使得北極熊賴以生存的世界正在逐漸融化，旨在說明目前北極熊的生存已經(jīng)受到了嚴(yán)重的威脅．

解答 答案：
61．warmer   考查形容詞的比較級(jí)   根據(jù)句中的連詞than可知，此處表示二者之間的比較，應(yīng)使用形容詞的比較級(jí)；故用warmer．
62．For/During    考查介詞  此處用在表示一段時(shí)間的詞組前面，意為：在一年中的大部分時(shí)間里，故用for/during．
63．them   考查人稱代詞    此處在句中作賓語，指代的是Polar bears；故用them．
64．threatens   考查時(shí)態(tài)   此處在that引導(dǎo)的定語從句中作謂語，根據(jù)上下文都使用了一般現(xiàn)在時(shí)可知，本文介紹的是北極熊現(xiàn)在的處境；由于主語danger為名詞的單數(shù)形式，故用threatens．
65．since   考查從屬連詞   此處構(gòu)成了本句的時(shí)間狀語，根據(jù)從句使用了現(xiàn)在完成時(shí)可知，此處的意思是：自從…以來；故用since．
66．survival   考查名詞    此處用在形容詞性的物主代詞their之后，意為：他們的生存；故用名詞survival．
67．a(chǎn)   考查不定冠詞    此處用在單數(shù)名詞scientist 之前，表示泛指一位科學(xué)家；故用a．
68．Without   考查句意理解以及介詞     此處在句中作狀語，意為：沒有它（海冰），他們就不可能存在；故用介詞without．
69．But  考查句意理解以及連詞    本句的意思是：一些極地冰的融化與重新凍結(jié)是很自然的，但是在一個(gè)更暖和的世界，這些周期便加快了；此處用在句首，表示的是轉(zhuǎn)折關(guān)系，故用But．
70．when   考查句意理解以及連詞    本句的意思是：當(dāng)熊不積極打獵時(shí)，這些額外的脂肪后來就會(huì)被用掉；此處指的是：當(dāng)…時(shí)候，故用when．

點(diǎn)評(píng) 本題主要考查了各種語法在短文中的具體運(yùn)用．做本題時(shí)，需要在正確理解短文的前提下，逐句分析句意以及所考查到的語法現(xiàn)象；因此在平時(shí)的學(xué)習(xí)中，應(yīng)熟練掌握各種語法知識(shí)，其中包括詞法，句法，各種時(shí)態(tài)語態(tài)以及虛擬語氣等．

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B．People use recycled materials as much as possible．
C．Fishermen move elsewhere when there is no fish left．
D．Foresters leave the place where there is no wood left．
31．The writer tries to make us believe thatB．
A．mankind has been progressing mainly through traveling about
B．it's unwise for mankind to use the land in an uncontrolled way
C．it's quite good for students to learn more about the history of mankind
D．teachers should encourage students to voice their own opinions brvely．

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科目：高中英語 來源： 題型：閱讀理解

14．If English means endless new words，difficult grammar and sometimes strange pronunciation，you are wrong．Haven't you noticed that you have become smarter since you started to learn a language？
According to a new study by a British university，learning a second language can lead to an increase in your brain power．Researchers found that learning other lan guages changes grey matter．This is the area of the brain which processes information．It is similar to the way that exercise builds muscles．
The study also found the effect is greater when the younger people learn a second language．A team led by Dr．Andrea Mechelli，from University College London，took a group of Britons who only spoke English．They were compared with a group of"early bilinguals"who had learnt a second language before the age of five，as well as a number of later learners．
Scans showed that grey matter density （密度） in the brain was greater in bilinguals than in people without a second language．But the longer a person waited before mastering a new language，the smaller the difference．
"Our findings suggest that the structure of the brain is changed by the experience of learning a second language，"said the scientists．It means that the change itself increases the ability to learn．
Professor Dylan Vaughan Jones of the University of Wales，has researched the link between bilingualism and maths skills．"Having two languages gives you two windows on the world and makes the brain more flexible （靈活的），"he said．"You are actually going beyond language and have a better understanding of different ideas．"
The findings were matched in a study of native Italian speakers who had learned English as a second language between the ages of two and thirty-four．Reading，writing，and comprehension were all tested．The results showed that the younger they started to learn，the better．"Studying a language means you get an entrance to another world，"explained the scientists．
32．The main subject talked about in this passage isC．
A．science on learning a second language    
B．man's ability of learning a second language
C．that language can help brain power       
D．language learning and maths study
33．The underlined word"bilingual"probably meansC．
A．a(chǎn) researcher on language learning        
B．a(chǎn) second language learner
C．a(chǎn) person who can speak two languages    
D．a(chǎn)n active language learner
34．We may know from the scientific findings thatA．
A．the earlier you start to learn a second language，the higher the grey matter density is
B．there is no difference between a later second language learner and one who doesn't know a second language
C．the experience of learning a second language has bad effect on people's brain
D．the ability of learning a second language is changing all the time
35．In the last two paragraphs，the author wants to tell us thatB．
A．learning a second language is the same as studying maths
B．early learning of a second language helps you a great deal in studying other subjects
C．Italian is the best choice for you as a second language
D．you'd better choose the ages between 2 and 34 to learn a second language．

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科目：高中英語 來源： 題型：閱讀理解

15．Measuring up to 10.5 feet in length，the western green mamba （曼巴蛇） is the second longest snake in Africa，with the black mamba being the first．It is also the most agile （敏捷的） snake in the mamba family．Their color is changeable，which helps them join their environment．Another distinctive feature of the snake is its long tail with a sharp point．
The western green mamba lives in rain forests．Being an arboreal species，these snakes spend most of their time moving among the tree tops．However，they usually leave their trees to pursue a potential meal on the ground．The western green mamba is mostly active at day，but can also be seen hunting at night．
The diet of a western green mamba consists of birds and a variety of small mammals such as squirrels，mice and even bats．These snakes will approach their targets with the help of their natural skin color．When they are close enough，they will bite their victims and inject them with venom（毒液） quickly．Once the target has died，the weatern green mamba will swallow its meal whole．If faced with danger，these snakes will try to run away．If they are cornered，however，they will become extremely aggressive and strike with their sharp teeth repeatedly．The female weatern green mamba is the one who lays eggs．She will lay eggs anywhere．The young snakes are completely independent．The mother and father play no part in raising the baby snakes．The babies are born with everything they need to survive in the wilderness．They will have almost no natural predators（捕食者）to worry about when they reach adulthood．
29．In order to avoid being found，the western green mambaD．
A．spends most of the day sleeping
B．rarely comes out to hunt for food
C．tends to stay on trees most of the day
D．hides itself well with the help of its skin color
30．What does the underlined word"arboreal"in the second paragraph probably mean？C
A．Mainly feedig on meat．
B．Mainly feeding on plants
C．Living on trees most of the time           
D．Living in the grass most of the time
31．When is the western green mamba most aggressive？D
A．when it has to protect its eggs
B．When it is searching for food．
C．When it approaches its target
D．When it gets no way to escape
32．What can we learn from the text？D
A．The western green mamba can be found all over Africa．
B．The western green mamba is the longest snake in Africa．
C．The western green mamba often swallows live animal whole．
D．The baby western green mamba doesn't need care．

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