题目内容
3.Now scientists believe that global warming affects hibernating animals,causing them to wake up earlier.While this may seem a little concern,it is in fact a serious environmental problem.The shortened hibernation period could actually lead to significant decreases in the population of several species.Some of the first evidence of the problem came from Colorado,where researchers at the Rocky Mountain Biological Lab have been observing marmot (旱獭) hibernation behavior since the 1970s.In the early days of their studies,marmots generally hibernated several weeks into the month of May.Nowadays,however,temperatures in the area have risen by 2.5degrees Fahrenheit,and the marmots wake up about a month earlier.
At least the marmots are still hibernating.Several other animals have not been hibernating at all recently.Brown bears in the Spanish Cantabrian Mountains did not hibernate last year.Chipmunks (花鼠) in the US and some snakes in Australia also skipped the hibernation period.The bears seem to have survived without losing many individuals.The chipmunks and snakes,however,were not so lucky.Many of the animals died of starvation during the winter.
The problem with animals waking up early,or skipping hibernation altogether,lies with the creatures'metabolism (新陈代谢).When the animals hibernate,their metabolism drops significantly.The animals'heart rate slows,and they require very little energy to live.When the animals awake in the spring,their metabolism returns to normal.
But while their metabolism may be as active as it was before hibernation,food sources aren't as available as they were before.A marmot may wake up when temperatures get warmer,thinking it's spring,but plants will not have got the amount of sun they need to grow.So until the plants grow,the marmots have no reliable food source.
Many scientists believe the problem will continue to get worse.For many biologists,that's a scary prospect.Terry Root,an animal expert at Stanford University,said,"I do think what we will be facing is the extinction of many species."
32.What is the viewpoint of the writer?B
A.Global warming will continue to get worse as time goes on.
B.Waking up early in spring may lead to the extinction of some animals.
C.Shortened hibernation will definitely decrease the population of animals.
D.Animals which do not hibernate die of starvation.
33.The writer sets the example of the marmot in order toA.
A.indicate that global warming influences animals'hibernation
B.explain that the weather gets warmer and warmer now
C.show that the weather in the United States is quite different
D.say some animals do not hibernate now due to warm weather
34.Judging from recent observation,which of the following animals suffered the LEAST from shortened hibernation?A
A.Brown bears.
B.Marmots.
C.Some snakes in Australia.
D.Chipmunks in the US.
35.Why can't marmots find enough food when they wake up?D
A.Because there are too many marmots in the wild now.
B.Because more and more animal species skip hibernation now.
C.Because winter days end much earlier than before.
D.Because plants haven't received enough sunlight for spring growth.
分析 本文讲述了科学家们认为全球变暖会影响冬眠的动物,使他们更早醒来.这似乎是一个小问题,但是却是很严重的环境问题,使我们正在面临许多动物物种的灭绝.
解答 32.B.细节理解题.由第一段The shortened hibernation period could actually lead to significant decreases in the population of several species.,缩短冬眠期事实上会导致几个物种种群的显著下降,可推知这会导致动物灭绝,故选B.
33.A.理解判断题.由第二段Nowadays,however,temperatures in the area have risen by 2.5degrees Fahrenheit,and the marmots wake up about a month earlier.可知该地气温上升2.5华氏度,土拨鼠会提前一月醒来.即气温上升影响动物冬眠,故选A.
34.A.细节理解题.由第三段The bears seem to have survived without losing many individuals,可知熊失去的数量最少,故选A.
35.D.由倒数第二段but plants will not have got the amount of sun they need to grow,植物没有获得足够的阳光来满足生长所需,故选D.
点评 科教类阅读难度比一般阅读较大,它存在的生词比较多,因此考生应当综合略读、跳读和查读,猜词等阅读技巧来做题,平时也应加强练习.
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