Which of the following questions does the passage answer? It can be inferred from the passage that lichens use less energy and

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问题 Which of the following questions does the passage answer?
It can be inferred from the passage that lichens use less energy and grow more slowly when ______.

选项 A、the environment is polluted
B、they are exposed to ultraviolet rays
C、they are very old
D、the supply of water is inadequate

答案D

解析
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