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.
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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
单项选择题
According to the passage, a developmental disability ______.
A．develops very slowly over time
B．is caused by outside forces
C．occurs in youth and affects development
D．is getting more and more severe
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