人教版（2019）必修第二册《Unit 2 Wildlife Protection》2022年同步练习卷（Reading and Thinking 课时练习）
发布：2024/4/20 14:35:0
一、词汇运用：
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1．As we all know，Pandas are precious
（生物）．组卷：11引用：6难度：0.7 -
2．Laughter is one of the most infectious expressions of
（强烈的情感）.组卷：2引用：3难度：0.6 -
3．Palm trees
（搅动） in the soft Pacific breeze.组卷：1引用：3难度：0.8 -
4．In the larger
（街区），I usually feel very unsafe.组卷：1引用：2难度：0.7 -
5．The nature
（保护区） covers an area of some 1，140 square kilometres.组卷：21引用：5难度：0.7
三、阅读理解：
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16．More than two thirds of the world's 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.The 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，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 scientists 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 computer had been forecasting.Satellite observations have showed that the ice has decreased to an all-time 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 wealthy "sportsmen" who want their skins and heads.At least ten international companies offer bear-hunting 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 on 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 can't catch enough food without ice.
B．Because polar bears eat ice when they feel thirsty.
C．Because polar bears will be 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 end of this century.
D．Scientists have found that most animals in the Arctic will die out by the end of this century.组卷：16引用：1难度：0.5 -
17．You've probably learned that bears eat a lot before hibernating （冬眠），putting on weight suddenly.It's an enviable practice，because those bears don't have the same health problems as fat people.A study published in Cell Reports has found that it might be due to the bear's 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 researchers collected the samples of their waste from 16 wild bears during hibernation and in summer.What they found is that the bear's lifestyle changes dramatically with seasons.During hibernation，the kinds of microbiomes became less than the summer samples.
To find out how that might affect metabolism （新陈代谢），the researchers transferred the microbes from the winter and the summer into lab jye.ai.Mice with the summer microbes gained more weight than those with the winter microbes.However，those fatter summer mice weren't different from the winter mice in their glucose （葡萄糖） metabolism. "Thus，the 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 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 bacteria，improving glucose metabolism and fat burning abilities in mice.
（1）Why don't bears suffer the same health problems as fat people？
A．Because of hibernation.
B．Because of no exercise.
C．Because of their special food intake.
D．Because of some friendly gut microbes.
（2）What can we learn from the text？
A．Bears' weight increases quickly during hibernating.
B．Bears' lifestyle changes greatly in different seasons.
C．Bears' microbiomes in summer are less than those in winter.
D．Bears' glucose metabolism varies with seasons.
（3）What's the author's attitude to the benefits of the research for human？
A．Favorable.
B．Disapproving.
C．Cautious.
D．Curious.
（4）What is the passage mainly about？
A．The way of bears' metabolism.
B．The seasonal lifestyles of bears.
C．The approach to treating obesity.
D．The cause of bears' healthy obesity.组卷：14引用：1难度：0.5
