填空题

Their income increased by 21 percent over that of the previous year.

【参考答案】

D

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单项选择题

This passage mainly tells the reader how_________.

A．the London Underground works
B．the London Underground develops
C．a passenger buys a subway ticket
D．a passenger travels on subway train

填空题

First of all, our purpose is to apply science and technology to the solution of practical problems.

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