单项选择题

A. Read the operational manual.
B. Try the buttons one by one.
C. Make the machine run slowly.
D. Ask her instructor for advice.
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单项选择题
A. Great pressure on housing.B. Rising demands of goods.C. The prosperity of the building industry.D. A declining market for manufactured goods.

A. Great pressure on housing.
B. Rising demands of goods.
C. The prosperity of the building industry.
D. A declining market for manufactured goods.
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A..There is no space to put in solar units.B. It is decided by Mother Nature.C. It is not the right time to use it.D. It costs too much to use it.

A..There is no space to put in solar units.
B. It is decided by Mother Nature.
C. It is not the right time to use it.
D. It costs too much to use it.
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