单项选择题

Which of the following statements is INCORRECT

A．Astronomers believe that the universe is built of the same matter.
B．Proper conditions are essential to the existence of life.
C．Double stars can provide steady light and heat.
D．Astronomers believe that other solar systems are similar in structure to ours.

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单项选择题

What kind of planet elsewhere in the universe can support life

A．Those double stars' planets.
B．Those planets much hotter than our earth.
C．Those planets similar to the earth.
D．Those planets very close to their suns.

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.