单项选择题

A．It would do him good to go out for a while.
B．He ought to do the first ten problems again.
C．She could help him with the problems.
D．He should be finished with the problems by two.
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单项选择题
A．Operate metal detectors.B．Require each passenger to show photo identification.C．Make a body search by hand.D．Operate X-ray machines to screen baggage.
A．Operate metal detectors.
B．Require each passenger to show photo identification.
C．Make a body search by hand.
D．Operate X-ray machines to screen baggage.
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