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.

admin2014-07-10  44
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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