单项选择题


A．absorbs
B．expels
C．incites
D．exhales
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单项选择题
A．soB．such,C．muchD．many
A．so
B．such,
C．much
D．many
单项选择题
The two research teams mentioned in the passage endeavor
A．to track samples at more sewage-treatment facilities
B．to determine latent chemical dangers in the water
C．to measure the exact amount of any drug found in drinking water
D．to find out the precise number of contaminants in freshwater streams
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