题目内容

当一个类实现接口时,沒有必要实现接口中的所有方法。

A. 对
B. 错

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Sally as well as her brother ___reading books.

A. likes
B. like
C. liked
D. is liking

Wind power is an ancient source of energy __________ we may return in the near future.

A. on which
B. by which
C. to which
D. at which

Not surprising that the process of choosing names __________widely from culture to culture.

A. varies
B. varying
C. differing
D. various

The case of two missing boys in this area is being_____.

A. looked up
B. looked into
C. looked for
D. looked after

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