单项选择题

A．Examine whether these children were healthy.
B．Find out whether their mothers had smoked.
C．Find why these children suffered breathing problems and lung disease.
D．Look into the effect that mother’s smoking had on their children.
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单项选择题
A．A new fuel for buses.B．The causes of air pollution.C．Careers in environmental engineering.D．A way to improve fuel efficiency in buses.
A．A new fuel for buses.
B．The causes of air pollution.
C．Careers in environmental engineering.
D．A way to improve fuel efficiency in buses.
单项选择题
A．Sue is a quiet girl now.B．Sue becomes quite talkative.C．Sue has been talkative all the time.D．Sue is used to being talkative.
A．Sue is a quiet girl now.
B．Sue becomes quite talkative.
C．Sue has been talkative all the time.
D．Sue is used to being talkative.
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