单项选择题

A．Wait for the lecture to begin.
B．Go immediately to their seats.
C．Get something to drink first.
D．Sit down and enjoy the lecture.
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单项选择题
The airborne particulates tend to wind up in the Northeast airborne here means.
A．produced by air
B．emerged in the air
C．floating
D．polluting
单项选择题
A．The high temperatures required for its use.B．The high cost of materials used in its production.C．The lack of trained environmental engineers.D．The opposition of automobile manufacturers.
A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
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