B. Global warming will lead to shortened hibernation of some animals.
C. Shortened hibernation will result in declines in the population of animals.
D. Some animals will skip hibernation altogether.
【解析】选C。细节理解题。由第一段最后一句话可知答案为C。
2. The writer sets the example of the marmot so as to ________ .
A. explain that global warming influences animals’ hibernation
B. indicate 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
【解析】选A。细节理解题。根据第二段最后一句话可知作者是想借这个例子来说明全球变暖使得动物的冬眠期缩短了。
3. The underlined word “slumber” in the fourth paragraph means“ ________ ”.
A. weather
B. activityC. nestD. sleep
【解析】选D。词义猜测题。联系本句中的awake from可知答案为D项。
4. Why can’t marmots find enough food when they wake up?
A. Because there are too many marmots in the wild now.
B. Because plants haven’t received enough sunlight for spring growth.
C. Because winter days end much earlier than before.
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