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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单项选择题
It is suggested in this passage that _____.
A．scientists have found evidence to prove there are many Earth-like planets in our galaxy
B．theoretically there are a great number of Earth-like planets capable of supporting life
C．our Earth is the only planet in our galaxy that can support life
D．with more powerful telescopes, scientists will be able to find more galaxies in the universe
单项选择题
Barrie Jones and Nick Sleep have found ______.
A．100 planets orbiting around other stars like our sun
B．many planets' atmosphere has the same composition as Jupiter
C．the ways to tell which solar system may have Earth-like planets
D．a mathematical model to measure the distance of newly found solar-systems
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