单项选择题

These pollutants can be ______ hundreds and even thousands of kilometers by large air masses.

A．contained
B．conveyed
C．contaminated
D．conserved
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单项选择题
Some people think it's ______ to smoke with a cigarette holder.
A．flexible
B．sophisticated
C．versatile
D．productive
单项选择题
Of the 1, 200 million people who call themselves Chinese, ______ a very small number speak what is referred to as standard Chinese.
A．none but
B．but for
C．all but
D．but then
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