Exception类称为异常类，它表示程序本身可以处理的错误，在开发Java程序中进行的异常处理，都是针对Exception类及其子类。
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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
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
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