单项选择题

Polluted air is deleterious ______ human health.

A．of
B．to
C．on
D．for
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单项选择题
At the car park ______ a boy and his parents who are going to the shopping mall.
A．are
B．were
C．is
D．was
单项选择题
A．thatB．itC．whichD．one
A．that
B．it
C．which
D．one
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