单项选择题

A．Chemicals.
B．Vapor.
C．Water.
D．Gas.
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单项选择题
A．A weekday afternoon.B．A weekday evening.C．A weekend afternoon.D．A weekend evening.
A．A weekday afternoon.
B．A weekday evening.
C．A weekend afternoon.
D．A weekend evening.
单项选择题
A．It had many problems.B．It was the most democratic country in the world.C．It was fair to women.D．It had some minor problems to solve.
A．It had many problems.
B．It was the most democratic country in the world.
C．It was fair to women.
D．It had some minor problems to solve.
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