问答题

Some species of animals __________________ (因为不能适应环境的变化，所以已经灭绝了).

【参考答案】

have become extinct because they could not adapt (themselves......

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Younger siblings from large families ______.

A．were unlikely to get stomach cancer
B．were inescapable to get stomach cancer
C．were especially prone to get stomach cancer
D．would live happily

填空题

History was shown that the belief that ______ is dangerous.

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