单项选择题

A．To tell the man that they can be used as building materials.
B．To tell us how important they are to our daily life.
C．To explain what properties they have for different uses.
D．To explain how interesting and useful chemistry science is.
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单项选择题
The number of refereeing errors in the experimental matches was ________.
A．slightly above average
B．higher than in the 1998 World Cup
C．quite unexpected
D．as high as in a standard match
单项选择题
A．Her whole life after the divorce.B．Her children’’s education.C．Money to support her and her children.D．Lack of chance to be remarried.
A．Her whole life after the divorce.
B．Her children’’s education.
C．Money to support her and her children.
D．Lack of chance to be remarried.
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