单项选择题

Which of the following statements is NOT true

A．Wood-burning stoves are safer and more efficient than they used to be.
B．No factories exist for the purpose of producing dirty wood chips.
C．Both catalytic combustors and wood agitators save money in the long run.
D．Wood-burning stoves with catalytic combustors cost between $100 and $ 200.

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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.

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.