单项选择题

A．Minerals.
B．Chemical pollutants.
C．Salt.
D．Germs.
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单项选择题
A．He has a headache.B．He failed his history exam.C．He is sleepy.D．He is too busy.
A．He has a headache.
B．He failed his history exam.
C．He is sleepy.
D．He is too busy.
单项选择题
A．The library is in the busiest part of the city.B．The library has grass and trees around it.C．The roof of the Main Reading Room is 41 feet high.D．Its rooms are very large.
A．The library is in the busiest part of the city.
B．The library has grass and trees around it.
C．The roof of the Main Reading Room is 41 feet high.
D．Its rooms are very large.
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