单项选择题

A．They are kept aloft by air currents.
B．They combine with other chemicals in the atmosphere.
C．Most of them evaporate.
D．Their electrical charges draw them away from the eart
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单项选择题
A．They are good friends.B．They are former schoolmates.C．They are neighbors.D．They are former workmates.
A．They are good friends.
B．They are former schoolmates.
C．They are neighbors.
D．They are former workmates.
单项选择题
A．He is too proud.B．He has a high aspiration.C．He is very talented.D．He is painstaking in his work.
A．He is too proud.
B．He has a high aspiration.
C．He is very talented.
D．He is painstaking in his work.
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