单项选择题

A．A river pilot on the Mississippi.
B．A printer’’s apprentice.
C．A taxi driver.
D．A newspaper reporter.
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单项选择题
A．Because a bell tower was to be built on the site.B．Because it was found unsafe.C．Because its parking lot was to be constructed there.D．Because no one wanted to preserve it.
A．Because a bell tower was to be built on the site.
B．Because it was found unsafe.
C．Because its parking lot was to be constructed there.
D．Because no one wanted to preserve it.
单项选择题
The primary purpose of the passage is to ________.
A．explain the differences in the working of a heat pump when the outdoor temperature changes
B．contrast the heating and the cooling modes of heat pumps
C．describe heat pumps, their use, and factors affecting their use
D．advocate the more widespread use of heat pumps
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