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
The passage mainly describes the value of the stocks from the view of the stockholders and the corporation.
A．Y
B．N
C．NG
单项选择题
A．For a presentation at a seminar.B．For an assignment by her professor.C．For a thesis required by the course.D．For an understanding about Dickens.
A．For a presentation at a seminar.
B．For an assignment by her professor.
C．For a thesis required by the course.
D．For an understanding about Dickens.
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