单项选择题

A．They are never effective.
B．They are simple to perform.
C．They are not always very easy.
D．They are usually valid.
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单项选择题
A．He enjoyed using his new camera.B．He left his camera at the airport.C．He left his camera in his friend’s ear.D．He lost his camera on his trip.
A．He enjoyed using his new camera.
B．He left his camera at the airport.
C．He left his camera in his friend’s ear.
D．He lost his camera on his trip.
单项选择题
A．A passport.B．A check.C．A driver’s license.D．A ticket.
A．A passport.
B．A check.
C．A driver’s license.
D．A ticket.
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