单项选择题

A．three
B．four
C．six
D．seven
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单项选择题
A．air-conditionersB．closed-circuit TVC．projectorsD．tape-recorders
A．air-conditioners
B．closed-circuit TV
C．projectors
D．tape-recorders
单项选择题
A．cheapB．warm in winterC．old but beautifulD．newly built
A．cheap
B．warm in winter
C．old but beautiful
D．newly built
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