在工程网络计划中，M工作的最早开始时间为第16天，其持续时间为4天，该工作有三项紧后

用所给短语的适当形式填空（每题1分共10分）

get away with    play a trick on     dress up   take place 

turn around      make sure  burst into laughter  as usual 

be familiar with   look forward to

1. Great changes _______________in the rural areas in the last two decades.

2 .She is ___________________going home on May Day.

3.They _______and went to the dancing hall together.

4. Our monitor successfully ___________all of us on April Fool’s Day.

5. I don’t know how he managed to _____________stealing the bike.

6. As parents, you must ________ that the children get enough sleep.

7.He looked at his watch, knowing that she was late again__________.

8. As she came to know him better, she _______________him more.

9.When the teacher __________,the students began to make faces and talk .

10 .On hearing the funny story, everybody_______________.

64D型单线半自动闭塞，列车整列到达，接车站拉出闭塞按钮后，接车站接发车表示灯为（）。

A、红灯

B、黄灯

C、绿灯

D、无显示

原发性恶性骨肿瘤的一般X线表现是（）

A.骨质缺损，边缘清楚，骨膜反应明显

B.骨质破坏，边界不清，骨膜反应不明显

C.骨质密度增高，境界不清，骨膜反应明显

D.骨质破坏，边缘不清，骨膜反应明显

E.骨质缺损，边缘清楚，骨膜无反应

中美大使级会谈的由来是什么？

简述石料的抗冻性能试验步骤。