单项选择题

A．Cigarette ashes.
B．Nicotine.
C．Tar.
D．Not mentioned.
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单项选择题
A．Singing loudly.B．Listening to music.C．Studying.D．Talking on the phone.
A．Singing loudly.
B．Listening to music.
C．Studying.
D．Talking on the phone.
单项选择题
A．The shortage of water,B．The shortage of food.C．The condition of weightlessness.D．The great pressure outside the spacecraft.
A．The shortage of water,
B．The shortage of food.
C．The condition of weightlessness.
D．The great pressure outside the spacecraft.
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