2. 外语
  3. Which sentence below best expresses the essential information in the highlighted sentence in the passage? According to the princ

Which sentence below best expresses the essential information in the highlighted sentence in the passage? According to the princ

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问题 Which sentence below best expresses the essential information in the highlighted sentence in the passage?
According to the principle of allocation, each animal has a limited amount of energy that can be used for obtaining food, escaping from predators, regulating body temperature, and other basic maintenance needs. Whenever energy is used for coping with environmental fluctuations, it is not available for other functions. Small birds such as wrens must use 99 percent of their energy just to stay warm and active. Because their maintenance costs are so high, wrens have little energy for allocating to other functions, such as growth and reproduction.
选项 A、Wrens have so much energy that they are active 99 percent of the time.
B、It is difficult for wrens to stay warm because they need so much energy.
C、When wrens use energy for growth, they have none left over for reproduction.
D、Wrens use much energy for maintenance, so they have little for other purposes.
答案D
解析 Wrens use much energy for maintenance, so... is a paraphrase of Because their maintenance costs are so high.......they have little for other purposes is a paraphrase of ...wrens have little energy for allocating to other functions, such as growth and reproduction.
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