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.
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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
单项选择题
Why are very hot stars referred to as ghosts
A．They are short-lived.
B．They are frightening.
C．They are mysterious.
D．They are nearly invisible.
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