单项选择题

Astronomers believe that matter in different parts of the universe

A．obeys different laws.
B．obeys one common law.
C．obeys the same laws.
D．obeys no common law.
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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.
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.
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