问题: Farmersusechemicalsandfertilizerinorderto__________.
A: urgeachangeinourpresentdiet
B:interestedinsweetenedfood
C:worriedaboutmodernfood
D:increasetheyieldsoftheircrops
E:muchofthefoodtheyeatisnotgoodforhealth
F:improvetheirworkingconditions
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