单项选择题

A．Unemployment.
B．Family breakup.
C．Mental problems.
D．Drinkin
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单项选择题
A．Neither of the two types of rockets is very economical.B．The liquid-fuel rocket is best.C．Each type of rocket has certain advantages.D．The solid-fuel rocket is best.
A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
单项选择题
A．To encourage them.B．To stop them immediately.C．To give some explanation.D．To leave them alon
A．To encourage them.
B．To stop them immediately.
C．To give some explanation.
D．To leave them alon
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