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
In the last few minutes the conversation has become seemingly______as if the discussion were of some minor domestic matter and not survival itself.
A．crucial
B．central
C．casual
D．causal
单项选择题
There are a few small things that I don't like about my job, but______it's very enjoyable.
A．all at once
B．once and for all
C．so much as
D．by and large
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