一个角的补角和这个角的余角的2倍互为补角，求这个角的度数．

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问题解答题

答案

解：设这个角为x度，则x的余角为（90﹣x）°，补角为（180﹣x）°，

则有（180﹣x）+2（90﹣x）=180，

解之得：x=60．

故这个角的度数为60 °．

选择题

— What do you think of the bottled water?

— I don’t like it at all. It is reported that much nutrition, including some minerals, ______ while it is being processed.

A．are ridded of

B．are gotten rid of

C．gets rid of

D．is ridded of

判断题

过敏最常见的目标器官是皮肤、黏膜、呼吸道、心血管系统。