单项选择题

A．The problem of lacking a mirror.
B．The problem of lacking a decoration for the lift.
C．A psychological problem.
D．A material problem.
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establishing
单项选择题
A．Because the hot air has to reach a certain temperature.B．Because the house is very big.C．Because termites try to escape by hiding in wooden beams.D．Because termites may survive for a full six hours.
A．Because the hot air has to reach a certain temperature.
B．Because the house is very big.
C．Because termites try to escape by hiding in wooden beams.
D．Because termites may survive for a full six hours.
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