题目内容

数据流图主要描绘信息在系统内部加工和流动的情况。

A. 对
B. 错

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Fill the blanks with the proper form of the word given.

1.A big power station()______in my home town now.

A. has been built
B. is being built
C. has built
D. is building

This kind of cloth ____ easily．

A. has washed
B. was washed
C. washes
D. is washed

Stamps______by people for sending letters.

A. use
B. using
C. used
D. are used