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

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.

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.