题目内容

The boys were on their mother's side and thought their father was wrong to call their mother "stupid".

A. 对
B. 错

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The American sailor presented a flower to the writer's daughter.

A. 对
B. 错

The French flower woman apparently came to this restaurant quite often for her business.

A. 对
B. 错

1与x的等比中项中有一个是5，则x的值为（）

A. -25
B. 25
C. 5
D. -5

在等比数列前n项和公式的推导过程中使用了法.