单项选择题

A．The man-made building materials let out dangerous gases inside houses.
B．There may be more harmful gases outside houses.
C．The flow of air indoors is limited.
D．Indoor air pollution can make a person seriously ill.
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单项选择题
A．It has broken down before.B．She generally doesn’’t allow people to borrow it.C．She is trying to sell it.D．She bought it from a friend.
A．It has broken down before.
B．She generally doesn’’t allow people to borrow it.
C．She is trying to sell it.
D．She bought it from a friend.
单项选择题
Which of the following people can repair and decorate their own houses
A．Skilled craftsman.
B．Handy of all ages.
C．Hopeful men.
D．Family supporters.
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