单项选择题

Which one of the following is NOT true for the reason why people prefer to buy wood-burning stoves

A．The initial cost is very low.
B．The fuel costs are cheaper.
C．Wood fires are more efficient, cleaner, and safer than ever before.
D．The wood-burning stoves are more efficient than gas or oil ones.

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单项选择题

The passage states that _______.

A．many Americans have switched from hydrocarbon-based fuels to wood because the price of the latter has risen.
B．some wood-burning stoves cost up to one hundred times more than others.
C．catalytic combustors increase the amount of pollution caused by wood burning stoves.
D．agitators are cheaper addition to wood-burning stoves than catalytic combustors.

单项选择题

According to the passage, the number of wood-burning stove sold for home use _______.

A．went up fivefold over a six-year period.
B．rose to seven million during the seventies.
C．multiplied thirty-five times between 1973 and the beginning of 1981.
D．increased by 6,000,000 over an eight-year period.

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