填空题

56()

【参考答案】

F

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单项选择题

Why blue lights are installed in many train stations()

A. Because they do not hurt human eyes.
B. Because they are cheaper than regular ones.
C. Because they can help people at night.
D. Because they can reduce the number of suicides.

单项选择题

In the Bay Area, a family needs to earn()the amount they do in other areas.

A. twice
B. five times
C. four times
D. three times