单项选择题

A．It is very commercial.
B．It is very insecure.
C．It is very noisy.
D．It is very unfriendly.
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单项选择题
A．Talking to someone over the phone.B．Playing a video game.C．Drinking some diet coke.D．Drinking extra tea.
A．Talking to someone over the phone.
B．Playing a video game.
C．Drinking some diet coke.
D．Drinking extra tea.
单项选择题
A．Their surface features.B．Their temperature.C．Their chemical composition.D．Their age.
A．Their surface features.
B．Their temperature.
C．Their chemical composition.
D．Their age.
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