单项选择题

A．Chemicals.
B．Vapour.
C．Water.
D．Gas.
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单项选择题
A．The speaker’s opinion about American society.B．The relationship between American parents and their children.C．American young people’s independence.D．American social values.
A．The speaker’s opinion about American society.
B．The relationship between American parents and their children.
C．American young people’s independence.
D．American social values.
填空题
What is common tragedy everywhere according to the passage
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