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．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.
单项选择题
A．3 million smokers increase every year.B．3 million people get lung cancer every year.C．3 million cigaretts ate produced every year.D．3 million people die from smoking every year.
A．3 million smokers increase every year.
B．3 million people get lung cancer every year.
C．3 million cigaretts ate produced every year.
D．3 million people die from smoking every year.
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