单项选择题


A．collected
B．distributed
C．assigned
D．finished
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单项选择题
A．funB．workC．learningD．prize
A．fun
B．work
C．learning
D．prize
单项选择题
To use chemicals and fertilizers means ______.
A．to increase the amount of foods
B．to increase the quality of foods
C．to increase the amount and quality of foods
D．to increase essential vitamins and minerals
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