单项选择题

Their cheerful voices showed that they were having a () discussion.

A．noisy
B．serious
C．friendly
D．lively

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单项选择题
—How can I use this washing machine —Well, just refer to the().

A．explanations
B．expressions
C．introductions
D．directions
单项选择题
Historically, () main material for making tables has been wood, but ()metal and stone have also been used.

A．the; 不填
B．不填; 不填
C．the; the
D．不填; the
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