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．They want to change the way English is taught.B．They learn English to find well-paid jobs.C．They want to have an up-to-date knowledge of English.D．They know clearly what they want to learn.
A．They want to change the way English is taught.
B．They learn English to find well-paid jobs.
C．They want to have an up-to-date knowledge of English.
D．They know clearly what they want to learn.
单项选择题
In British Columbia, the government is reluctant to restrict logging because it can provide jobs, profits, and taxes.
A．Y
B．N
C．NG
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