[求助】GWD24-4，关于生物除剂那篇，很不懂...

蔻华施

 The passage suggests that the author would  be most likely to agree with which of the following statements about the use of biocontrol agents?

 

A.    Biocontrol agent should be used only in cases where chemical pesticides have proven ineffective or overly dangerous.
        

B.    Extinctions and disruptions resulting from the use of biocontrol agents are likely to have increasingly severe commercial consequences.

C.    The use of biocontrol agents does not require regulation as stringent as that required by the use of chemical pesticides.

D.    The use of biocontrol agents may even finally supersede the use of chemical pesticides in controlling unwanted species.

E.     The risks of using native biocontrol agents may be easier to predict than the risks of using nonnative biocontrol agents.

GWD给的答案是E.可是我怎么觉得E是无关比较啊，文章中没有拿native和nonnative 的

来比较吧...

蔻华施

自己先顶起来...

sjtupeeler

还是有暗比较的，可以看最后一句有个词叫做especially，后面说的是nonnative的情况，反推可以native的情况

魏小妞要出国

Moreover, determining the potential risks of biocontrol agents before they are used is difficult, especially when a nonnative agent is introduced, because, unlike a chemical pesticide, a biocontrol agent may adapt in unpredictable ways, so that it can feed on or otherwise harm new hosts.