The word "premise"(Para. 1) probably means "______". Companies don’t want to spend money on research in developing appropriate

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问题 The word "premise"(Para. 1) probably means "______".
Companies don’t want to spend money on research in developing appropriate crops in Africa because ______.

选项 A、existing technology fails to grow dry-land crops
B、only dozens of years later can they make profits
C、they are not encouraged and probably cannot make any profit
D、most of African countries belong to the third world

答案C

解析 推断题。根据第四段第二句...there is no market incentive for companies...in Africa.由此可推断出C正确。D是针对此段末句设置的干扰项。公司不想投资研究开发适合在非洲地区种植的作物的原因在于这些谷物只适合当地种植,而不是因为大多非洲国家属于第三世界,故排除D。
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