单项选择题

The passage mentions all of the following factors for the existence of life EXCEPT

A．the right amount of atmosphere.
B．a steady supply of water.
C．steady heat and light.
D．the right distance from the sun.
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单项选择题
At the end of the passage the author suggests that
A．it is impossible for life to exist on other planets.
B．earthlike life could only exist on a few planets.
C．life could exist on only one planet in a million.
D．life could exist on a great number of planets.
单项选择题
The phrase the world in the first line of the passage refers to
A．"man".
B．"you".
C．"woman".
D．"they".
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