单项选择题

A．Burning oil will need black powder detectors.
B．A new environmental problem will arise from burning the oil.
C．Black powder detectors are useful machines in cleaning up the gases.
D．Residents near the oil lakes will breathe more oil vapors.
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单项选择题
A．The woman insists on going out.B．The woman doesn’’t like watching TV.C．The man promised her a gift on her birthday.D．The man is too tired to go out.
A．The woman insists on going out.
B．The woman doesn’’t like watching TV.
C．The man promised her a gift on her birthday.
D．The man is too tired to go out.
单项选择题
There may be some certain types of HIVs which have not been recognized yet.
A．Y
B．N
C．NG
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