Scientists will have to______new methods of increasing the world’s food supply in order to feed more hungry people.

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问题 Scientists will have to______new methods of increasing the world’s food supply in order to feed more hungry people.

选项 A、catch up with
B、come up with
C、keep up with
D、put up with

答案B

解析四个选项的意思分别是：catch up with赶上；come up with想出(答案、计划等)；keep up with跟上；put up with忍受。句意是，科学家必须要想出新的办法来增加世界的粮食产量，以满足越来越多的饥民的需要。所以正确答案是B选项，如：He came up with good ideas for the product promotion．(他想出一个推广产品的好方法。)

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Scientists will have to______new methods of increasing the world’s food supply in order to feed more hungry people.

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Valvularheartdiseasesarequitecommon,essentiallyresultinginimpairedbloodflowandwereverydifficulttotreat.Some30

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