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
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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
单项选择题
The goldilocks zone mentioned in the 5th paragraph most probable means ______
A．a certain fixed distance between a planet and sun
B．a range in the universe in which the planets' temperature is suitable for life
C．a range in the universe in which the planets can receive enough sunlight
D．a mathematical model to measure the size of the planetary system
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