锯电缆以前，应有那些安全措施？

阅读理解。

     The story is told about two people named David and Rosy Jackson. Both

of them had very bad memory. For example, Rosy would forget to cook

dinner，or David would go to work on Sunday，thinking it was Monday.

     One winter they were to take a long plane trip. When they arrived at the

airport, there was ten minutes left.In that situation(情况) anyone would get

into the plane right away.But Mr. and Mrs Jackson didn’t do so. They went

to buy the travel first. After they put a two-pound note into a machine , their

insurance policy came out."Who would get the money if the plane crashed,

I wonder?" asked Rosy."My mother，of course. " her husband replied.

"We'll post the policy to her. " Now be quick give me a stamp,will you?"

He said. "The plane is going to take off in a minute. " David put the stamp

on the  envelope, dropped it into a postbox. And suddenly he let out a cry.

What do you think happened to him? He had posted their plane tickets to

his mother.

1. This passage tells us that David and Rosy          .

    A. were always short of time

    B. always did everything in a great hurry

    C. were very forgetlul

    D. usually worked on Sunday

2. According to the passage, what does the "insurance"

     mean in Chinese?         

    A. 飞机票    

    B. 保险    

    C. 饮料    

    D. 纪念物

3. David wanted to post his mother           .

    A. the travel insurance policy       

    B. a two-pound note

    C. two plane tickets                       

    D. an empty envelope

4. Mr Jackson made such a foolish mistake because          .

    A. he was worried about his mother

    B. he had forgotten to bring a stamp

    C. he was worried about this flight

    D. his memory was poor and he was in a hurry

非居民企业在中国境内承包工程作业或提供劳务的，应当自项目合同或协议签订之日起（）日内，向项目所在地主管税务机关办理税务登记手续。

A.10

B.15

C.30

D.20

M161含意是细牙普通螺纹，大径为16mm，螺距为1mm。

精神世界丰富的人已经摆脱了生活的压迫，因而更平和更易长寿。

对堤岸防护工程的管理内容不包括查看和探测根石。