单项选择题

The main idea of this passage is ______.

A．Knowledge of a Computer
B．Importance of a Computer
C．Function of Knowledge
D．Function of Technology
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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.
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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