单项选择题

A．It is rather expensive.
B．It cannot provide enough hot water.
C．It cannot be used for heating the living room.
D．It produces a lot of work and dust.
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单项选择题
A．About 500,000.B．About 70,000.C．About 13,200.D．About 5,000,000.
A．About 500,000.
B．About 70,000.
C．About 13,200.
D．About 5,000,000.
单项选择题
A．Negative.B．Positive.C．Neutral.D．Indifferent.
A．Negative.
B．Positive.
C．Neutral.
D．Indifferent.
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