27. Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. (Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.) Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. (However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.) 作用句題目. 粗體字為第二句及最後ㄧ句 (A) The first supplies a context for the argument; the second is the argument's main conclusion. (C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction. 正解為C沒有問題. 但是想不透A是哪裡有錯. 第ㄧ句提供了本文的背景說明 第二句為結論似乎沒有問題. 麻煩各位高手 ~ --

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