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问题 单项选择题

液压试验也称漏失试验是在下完一层套管并注完水泥后，再钻穿水泥塞，钻开套管鞋下面（）之后进行的。

A、第一个砂岩层

B、第二个砂岩层

C、第一个泥岩层

D、第二个泥岩层

答案

参考答案：A

选择题

I have many friends, some        are businessmen.

A．of them

B．from which

C．who of

D．of whom
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填空题

根据汉语提示，完成下列句子，每空词数不限。

1. I'd like to collect ______________ (邮票) because they are interesting.

2. On Friday, many students are ______________ (困倦的) after a long week of classes.

3. _____________ (无论什么) you do, don't miss this exhibition.

4. Potato chips ______________ (发明) by mistake in 1853.

5. Could you tell me when Sue and Jack are ______________ (结婚)?
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