单项选择题

The most important requirement to have a life-supporting zone in any solar system is that it must have

A．enough water and proper temperature
B．enough oxygen and hydrogen
C．enough air and sunlight
D．enough water in any state
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单项选择题
So far, the solar system most like ours that have been discovered is ______.
A．in the group of stars known as Great Bear
B．2.5 times as big as Jupiter
C．smaller that our system
D．impossible for us to reach at present time
单项选择题
According to the author, under the two-party system, the two parties
A．hold opposing stands
B．cooperate with each other
C．slander each other
D．respect each other
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