如果交易丢失，计算机程序就不会产生月终余额。这属于（）

A．预防控制 

B．检测控制 

C．修正控制 

D．自由控制

句型转换。

1. By comparing with others, you will find your problems are not so terrible. (划线部分提问)

    ______ ______ you find your problems are not so terrible? 

2. It is interesting to send English messages to friends on a mobile phone. (改为感叹句)

    ______ ______ interesting thing it is to send English messages to friends on a mobile phone! 

3. It would be nice if we could get a room with a kitchen so we could cook our town meals. (改为同义句)

    It would be nice if we could get a room ______ ______ a kitchen so we could cook our own meals.

4. Being a volunteer is great. (改为反义疑问句) 

    Being a volunteer is great, ______ ______?

5. The woman teacher asked the students "Can you understand what I am saying?" (改为间接引语)

    The woman teacher asked the students ______ ______ could understand what she was saying.