单项选择题

What is the reason why so many people are ill

A．Rubbish is everywhere.
B．Air is everywhere.
C．Dirty air is everywhere.
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单项选择题
A．＄6.40.B．＄7.C．＄0.60.
A．＄6.40.
B．＄7.
C．＄0.60.
单项选择题
B
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