单项选择题

A．dust
B．dead human skin
C．quill-coverts
D．fluff
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单项选择题
A．FebruaryB．early MarchC．late MarchD．April
A．February
B．early March
C．late March
D．April
单项选择题
A．People shed more than any other animal indoors.B．People do not keep their room tidy.C．People’s skin flakes are small enough to float in the air and pollute the indoor air.D．The furniture people buy is in bad quality.
A．People shed more than any other animal indoors.
B．People do not keep their room tidy.
C．People’s skin flakes are small enough to float in the air and pollute the indoor air.
D．The furniture people buy is in bad quality.
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