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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The integration of staff for training has led to a good exchange of ideas, greater enthusiasm, and higher staff ______.
A．moral
B．mortal
C．morale
D．mores
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These pollutants can be ______ hundreds and eve thousands of kilometers by large air masses.
A．contained
B．conveyed
C．contaminated
D．conserved
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