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.

In the argument given, the two portions in boldface play which of the following roles?

(A) The first supplies a context for the argument; the second is the argument's main conclusion.

(B) The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that the argument denies will be part of that outcome.

(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.

(D) The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.

(E) The first and the second each provide evidence to support the argument's main conclusion.

为什么是c

thus之后是结论

However是转折，一定是和结论相反的东东

之前的东西是为什么会得出结论的依据

C

B错，argument没有denies结论

The first presents a development that the argument predicts will have a certain outcome

anyone could help to explain the meaning of this sentence?

up,up

anyone could help?thanks.

(A) The first supplies a context for the argument; the second is the argument's main conclusion.

我的分析：

Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. （issue） Unfortunately,说明不成功 the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones（这是客观的条件）.  Thus,（说明结论） for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.  However,（转折，与上文相反） since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise（论据）, the use of genetically engineered seeds of this kind is likely to become widespread.（结论）

是否不能认为上面标黄部分不是总结论？？？？

今天在prep上做到这题, boldface部分如下:

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.

所以A错.   B的denies错

就是说破解版的boldface有误？

这个很关键啊。