单项选择题

A．The way to ensure the survival of the human race on Venus.
B．The way to breed organisms on Venus.
C．The way to reduce the population of the Earth.
D．The way to conquer the universe.
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单项选择题
A．Three kinds of motivation and its different effectiveness.B．Negative outcomes of three kinds of motivation.C．The combination of three forms of motivation.D．How to make full use of three forms of motivation.
A．Three kinds of motivation and its different effectiveness.
B．Negative outcomes of three kinds of motivation.
C．The combination of three forms of motivation.
D．How to make full use of three forms of motivation.
填空题
Insulating and sealing up your house can save you ______.
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