单项选择题

A．medicines
B．chemicals.
C．products
D．elements
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单项选择题
A．filledB．pollutedC．stoppedD．blocked
A．filled
B．polluted
C．stopped
D．blocked
单项选择题
Where is Mr. Brown
A． He is with his teacher.
B． He’ s with his workers.
C． He is with the manager.
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