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题目材料：
DIRECTION:
Each of the following groups of statements includes ONE main idea and two supporting details.
Please mark on the statement this is the main idea.
Group 8
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A.A. Scientists have altered genes in tomatoes to make the fruit stay firm and ripe longer than natural tomatoes.
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B.Corn has been genetically changed to yield larger, more numerous kernels than native corn.
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C.A. Genetic changes to plants have resulted in superior food crops for human beings.
C显示答案
