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问题 单项选择题

在消费成功后若持卡人或收银员，发现消费金额有误或其他情况，此时收银员可以执行（）操作。

A、一次刷卡消费

B、执行撤销交易

C、执行签退操作

D、执行结算操

答案

参考答案：B

解答题

细胞中既含有无机物，也含有有机物．______．
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填空题

根据句意及首字母完成单词。

1. It is i   __   for him to finish the work in such a short time.

2. Our school is beautiful with h    __   of trees around it.

3. We hope to f   __   to the moon for vacation some day.

4. There is so much p   __   in this city;people must do something to stop it．

5. There are a lot of computer c   __   in our city.
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