单项选择题

From the first paragraph we can infer that in the US schools （）

A．students enjoy shooting
B．students are eager to be solider
C．safety is a problem
D．students can make guns

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单项选择题

Letter can express your （）

A．congratulations
B．condolences
C．best wishes
D．all of the above

单项选择题

What are not the resulting effects on cities when those people moved out（）

A．There were more crimes.
B．Cities were in a bad condition.
C．Only one mass transit system was completed.
D．Some small companies move in while larger ones moved out.