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 ( Para. 3), to which of the following does it refer
A．Yellow "hump".
B．Day.
C．Sun.
D．Hydrogen.
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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