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請依下文回答第 16 題至第 20 題 　　Would you ever eat a plant whose genes were altered by scientists in a laboratory? You probablyalready have, for genetically modified organisms (GMOs), also known as genetically engineeredorganisms, are 16 in modern food supplies. The concept underlying genetic modification is not new.For centuries, farmers have used a method called selective breeding to produce more 17 crops. They dothis by choosing seeds from plants that appear to be particularly 18 to pests and cold or dry weather andplanting those seeds in place of weaker strains. Over time, the desirable strains come to dominate thegenetic 19 of the farmers’ crops. Not everyone is supportive of the technology, however. Critics pointto the fact that GM foods are simply too new to be embraced, 20 that there could exist long-term healthrisks that have yet to surface. For instance, consumers with allergies have had adverse reaction to the implantedgenes.
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(A) mastered
(B) destroyed
(C) widespread
(D) compiled

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