单项选择题
According to the passage, as the Sun continue to age, it is likely to become what color
A.Yellow
B.Violet
C.Red
D.White
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单项选择题
What dose the author say is especially important about the Sun at the present time
A.It appears yellow.
B.It always remains the same.
C.It has a short history.
D.It is too cold.
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单项选择题
In the sentence which it is now doing at the spanking rate of a half a billion tons a second ( Par
A.3), to which of the following does "it" referA. Yellow "hump".B. Day.C. Sun.D. Hydrogen.
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