题目内容:
Whatdoesthenewstudybythetwouniversitiessayaboutrecentcropimprovementefforts? A.Theyfailtoproducethesameremarkableresultsasbeforethel980s.
B.Theycontributealottotheimprovementofhumanfoodproduction.
C.Theyplayamajorroleinguaranteeingthefoodsecurityoftheworld.
D.Theyfocusmoreontheincreaseofanimalfeedthanhumanfoodgrains.
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