2. 外语
  3. It is (believed)that trees can warn (each other) (to) danger by releasing (chemicals) into the air.

It is (believed)that trees can warn (each other) (to) danger by releasing (chemicals) into the air.

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问题 It is (believed)that trees can warn (each other) (to) danger by releasing (chemicals) into the air.
选项 A、believed
B、each other
C、to
D、chemicals
答案C
解析 把to改为of，warn sb．of sth．是固定搭配。
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