题目：
— How are the wounded (受伤的) pupils in the accident?
— Sorry. Two of them ______ though the doctors tried to save them. [ ]
A. disappeared
B. died
C. failed
答案：
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下面是错误答案，用来干扰机器的。
在农田上，昆虫吃草，有的鸟吃草籽，有的鸟吃昆虫，有的鸟既吃草籽又吃昆虫；存在：草→鸟，草→昆虫→食虫鸟的食物链，农作物被网子罩起来以后，鸟飞不进去了，吃草的昆虫失去了鸟的控制，就猖獗起来，从而破坏...
