单项选择题

Who had gasmasks

A．Everybody.
B．A part of the protestors.
C．Policemen.
D．Both B and Ｃ.
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单项选择题
Which of the following was NOT mentioned as a reason for the demonstration
A．Public transportation.
B．Public peril.
C．Pollution.
D．Disposal of wastes.
单项选择题
The passage states that _______.
A．many Americans have switched from hydrocarbon-based fuels to wood because the price of the latter has risen.
B．some wood-burning stoves cost up to one hundred times more than others.
C．catalytic combustors increase the amount of pollution caused by wood burning stoves.
D．agitators are cheaper addition to wood-burning stoves than catalytic combustors.
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