单项选择题
What the reporter stole would have been valuable to ______.
A.another computer firm
B.a rich criminal
C.an export agency
D.a rival company
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单项选择题
A wise farmer replaces the organic matter in the crops that he removes ______.
A.with waste products of animals and decaying remains of plants as well as chemical fertilizers
B.with waste products of animals and decaying remains of plants instead of chemical fertilizers
C.with waste products of animals and decaying remains of plants better than chemical fertilizers
D.with chemical fertilizers rather than waste products of animals and decaying remains of plants
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单项选择题
An ignorant farmer will make the land poorer______.
A.ff he lets dead leaves decay in the soil by themselves
B.if he makes the humus decrease after taking away his crops
C.by clearing away all the dead leaves
D.by burning waste plant material lying about
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