单项选择题

A．By passing steam over dry ice.
B．By turning ordinary ice into steam.
C．By melting dry ice.
D．By mixing dry ice with ordinary ice.
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单项选择题
A．Chemicals.B．Vapour.C．Water.D．Gas.
A．Chemicals.
B．Vapour.
C．Water.
D．Gas.
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.
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