失业的原因可能是（）。 A.经济原因 B.社会原因 C.组织原因 D.劳动者自身原因

The star always goes on                of the Christmas tree.[ ]

A. top               

B. right               

C. left

冲击危险程度的确定以（）和（）为主，结合电磁辐射仪、微震监测及地音监测等其它方法预测冲击危险。

使用白盒测试方法时，应根据______和指定的覆盖标准确定测试数据。

A．程序的内部逻辑

B．程序结构的复杂性

C．使用说明书

D．程序的功能

One evening, Mr. Green was driving his car along a lonely country road. He had _36__ $10 000 from the bank in town. Suddenly a man in rags stopped him and asked for a lift. Mr Green told him to  37  and continued his way.  38  he talked to the man, he __39__ that he had just broken out of prison. Mr. Green was very afraid at the __40__ of the money. Suddenly he saw a police-car and had a __41__ idea. He put on speed and 42 as quickly as possible. Then he found the police-car running __43__ him. After a mile or so, the police-car passed him and 44 him to stop. A policeman came up. Mr. Green had hoped to tell him about the trouble but the man put a gun to Mr. Green’s ___45__.

The policeman said he wanted Mr. Green’s name and _46__ and Mr. Green obeyed. The policeman wrote it down in his notebook and put it in his _47___. “You _48__ appear at the police station”. He said. Then he talked to Mr. Green about __49  driving. Mr. Green started up his car again. He had  50  all hope of his ￡10,000, but as he reached a more lonely part, the robber said he wanted to ___51__. Mr. Green stopped and the man said. “__52__. You’ve been __53__ to me. This is what I can do in __54__.” And he handed Mr. Green the policeman’s __55__, which was stolen while the policeman was talking to Mr. Green.

在UNIX系统中，文件分成三类，即普通文件， 【7】 和特殊文件。