1、高一英语必修二Unit 2课时练习（Reading and Thinking）一、词汇运用：1As we all know, Pandas are precious _(生物). 2Laughter is one of the most infectious expressions of _(情感). 3Palm trees _(搅动) in the soft Pacific breeze. 4In the larger _(街区), I usually feel very unsafe. 5The nature _(保护区) covers an area of some 1 ,140 squ
2、are kilometers . 6The rain forests are disappearing at an _(惊人的) _(速度). 7The organisms were forced to _(适应) in order to survive. 8The book is _(保留) to whoever comes first. 9As we know, water _(存在) in three forms: solid, liquid and gas. 10We must take a _(科学的) approach to the problem. 二、语法填空Li Hua an
3、d Wang Hai are two students of Senior One. Both of them work hard but they have various learning 1. (method). Li Hua listens to her teachers 2. (attentive) and asks her teacher 3. help as soon as possible if she has some problems. Because of this, she spends less time 4. (do) her homework, so it is
4、certain 5. she can keep energetic in the day. However, Wang Hai has quite a 6. (difference) way of learning 7. (compare) to Li Hua. He likes to sit up late at night doing his homework, so he often feels sleepy in class. As a result, he misses lots of key points, 8. makes it difficult for him 9. (con
5、centrate) on what he is doing. In my opinion, Li Hua learns more effectively in class and she must be a better 10. (learn). So I prefer her learning method. 三、完成句子：1.I am near-sighted and cant_ _（看清）what the teacher has written on the blackboard.2.When the dam was_ _（处于危险中），the whole village rushed
6、out to repair it.3.I have a dream that humans could live_ _ _（和谐相处）the beautiful nature.4.It_ _ _（使我想起）my days when I joined in the military training at senior high school.5.These websites offer young people the information and tools they need to _ _（看管）their money.四、阅读理解:AMore than two thirds of th
7、e worlds polar bears will be wiped out by 2050, according to a shocking new study. By then, scientists say, global warming will have melted 42 percent of the Arctic sea ice. By 2100, only a very few of these important creatures will be left.The report has been produced by the US Geological Survey. T
8、he scientists have publicized their findings in the hope of influencing US Interior Secretary Dirk Kempthorne, who has been asked to put polar bears on the US endangered species list.Polar bears depend on floating sea ice as a platform for hunting seals, which are their main food.Without enough ice,
9、 polar bears would be forced to go onto the land, where they are poorly skilled hunters, and would be unlikely to adapt to the life on the land in time. Experts say few little bears would survive and the stress could make many females unable to get pregnant.The team of American and Canadian scientis
10、ts spent six months studying bears, on the ground, from spotter planes and in the lab, using computer models. Some team members fear the result is even worse for the bears than what their report says. They say the Arctic is warming faster than anywhere in the world and much faster than their compute
11、r had been forecasting. Satellite observations have showed that the ice has decreased to an alltime low.However, not everyone in the scientific community believes that global warming is happening on such an alarming scale. Another investigation has found that polar bears are still being hunted by we
12、althy “sportsmen” who want their skins and heads. At least ten international companies offer bearhunting trips.1.What do we know about Dirk Kempthorne according to the passage?A.He is an animal scientist.B.He is a protector of animals working for the US government.C.He was asked to put polar bears o
13、n the US endangered species list.D.He offered to put polar bears on the endangered species list.2. Why will polar bears die out if there is not enough sea ice?A. Because polar bears cant catch enough food without ice.B. Because polar bears eat ice when they feel thirsty.C. Because polar bears will b
14、e easily found by hunters without ice.D. Because most female bears are used to giving birth under ice.3.What is this passage mainly about?A. Global warming makes the whole world different.B. Human beings are responsible for the endangered species.C. Most of the polar bears will be wiped out by the e
15、nd of this century.D. Scientists have found that most animals in the Arctic will die out by the end of this century.BYouve probably learned that bears eat a lot before hibernating (冬眠), putting on weight suddenly. Its an enviable practice, because those bears dont have the same health problems as fa
16、t people. A study published in Cell Reports has found that it might be due to the bears friendly gut microbes (肠道细菌).In summer, bears go through an extreme period of eating, while they eat nothing about six months during winter hibernation. To compare the microbiomes (微生物) of both seasons, the resea
17、rchers collected the samples of their waste from 16 wild bears during hibernation and in summer. What they found is that the bears lifestyle changes dramatically with seasons. During hibernation, the kinds of microbiomes became less than the summer samples.To find out how that might affect metabolis
18、m (新陈代谢), the researchers transferred the microbes from the winter and the summer into lab mice. Mice with the summer microbes gained more weight than those with the winter microbes. However, those fatter summer mice werent different from the winter mice in their glucose (葡萄糖) metabolism. “Thus, the
19、 bear may be atypical model for healthy obesity (肥胖) and studying hibernation might be a promising approach to developing new treatments for obesity,” the authors write.However, there are still more researches needed before humans benefit from bear gut microbes. The researchers note that relying on
20、free-ranging wild bears means they know little about their food intake and other habits. And though they were able to produce interesting metabolic results in mice, mice are quite different from humans. And another research suggests that exposure to cold can also change the composition of gut bacter
21、ia, improving glucose metabolism and fat burning abilities in mice.4Why dont bears suffer the same health problems as fat people?ABecause of hibernation.BBecause of no exercise.CBecause of their special food intake.DBecause of some friendly gut microbes.5What can we learn from the text?ABears weight
22、 increases quickly during hibernating.BBears lifestyle changes greatly in different seasons.CBears microbiomes in summer are less than those in winter.DBears glucose metabolism varies with seasons.6Whats the authors attitude to the benefits of the research for human?AFavorable.BDisapproving.CCautious.DCurious.7What is the passage mainly about?AThe way of bears metabolism.BThe seasonal lifestyles of bears.CThe approach to treating obesity.DThe cause of bears healthy obesity.
