Files can be lost or destroyed accidentally. Keep (74) copies of all data on removable storage media.

A．move

B．paste

C．backdown

D．backup

汉译英,每空一词。

1．-你们学校有电脑房吗?  -当然.

  -Is there a computer room in your school?

  -Yes,                                         

2．-你文具盒里有几把尺?  -只有一把.

  -How many rulers are there in your pencil-box?  

  -There is              .

3.他的裤子是黑色的.

  His                 black.

4. 在这一层有两个厕所.

  There are two ________  ________  this floor.

5．你的鞋子是什么颜色?

  What                 your shoes?