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

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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