求助PREP07的一道CR题。。

小c考托福

Traces of cultivated emmer wheathave been found among the earliest agricultural remains of many archaeologicalsites in Europe and Asia.  The only placewhere the wild form of emmer wheat has been found growing is a relativelynarrow strip of southwest Asia.  Sincethe oldest remains of cultivated emmer wheat yet found are from village sitesin the same narrow strip, it is clear that emmer wheat was first domesticatedsomewhere in that strip.

Which of the following, if true,most strengthens the argument?

(A) The present-day distribution ofanother wild wheat, einkorn, which was also domesticated early in thedevelopment of agriculture, covers a much larger area of southwest Asia.

(B) Modern experiments show thatwild emmer wheat can easily be domesticated so as to yield nearly as well astraditionally domestic strains.

(C) At the time when emmer wheatwas first cultivated, it was the most nutritious of all the varieties of grainthat were then cultivated.

(D) In the region containing thestrip where wild emmer wheat has been found, climatic conditions have changedvery little since before the development of agriculture.

(E) It is very difficult, withoutgenetic testing, to differentiate the wild form of emmer wheat from a closelyrelated wild wheat that also grows in southwest Asia.

完全不知道为什么选D。。还是答案有错。。。

susielei

我只说说我的看法哈~~~
题干：cultivated emmer wheat在Europe and Asia都有发现
         wild form of emmer wheat只在relatively narrow strip of southwest Asia发现
         又因为the oldest remains of cultivated emmer wheat 也在the same narrow strip发现
结论：emmer wheat was first domesticated in that strip（第一次人工种植是发生在the narrow strip)
A---讲其他品种的wheat，无关
B---野生的wheat很容易培育成产量和domestic strains一样，而我们需要的是地址信息，无关
C---人工种植的wheat营养价值很高，无关
D---在野生wheat发现的地方，气候自从有农业以来一直没变化。可以判断农业开始发展以后，由于气候没变化，     那个地区可能会一直长有wild emmer wheat，又因为那地区也发现了cultivated emmer wheat，所以可以判断第一次是在这个地方domestic wild emmer wheat。加强了题目的结论。（气候无变化建立了野生小麦和人工小麦的关联，可以建立一个由野生小麦培育至人工小麦的过程）
E---说两种野生wheat很难辨别，无关