单项选择题

A．a good many
B．more or less
C．more and more
D．a small number of
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单项选择题
A．medicinesB．chemicals.C．productsD．elements
A．medicines
B．chemicals.
C．products
D．elements
单项选择题
A．filledB．pollutedC．stoppedD．blocked
A．filled
B．polluted
C．stopped
D．blocked
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