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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单项选择题
What is the passage about
A．Faint dwarf stars.
B．The evolutionary cycle of the Sun.
C．The Sun's fuel problem.
D．The dangers of invisible radiation.
单项选择题
Most disabled people used to die early because ______.
A．disabilities destroyed major bodily functions
B．they were not very well looked after
C．medical techniques were not available
D．they were too poor to get proper treatment
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