单项选择题

A．It is not easy to get them away from the computers.
B．They are going all over the world with their teachers.
C．They don’t even want to go to class any more.
D．They are going to visit some libraries on earth.
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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．Its relative hardness.B．Its true color.C．Its chemical composition.D．Its relative purity.
A．Its relative hardness.
B．Its true color.
C．Its chemical composition.
D．Its relative purity.
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