再问section13-7,14,27

7.     Since the 1930’s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.

(A) wings, shaped so smoothly and perfectly

(B) wings, wings so smooth and so perfectly shaped

(C) wings that are shaped so smooth and perfect

(D) wings, shaped in such a smooth and perfect manner

(E) wings, wings having been shaped smoothly and perfectly so

b为什么对？逗号后wings做主语，两个句子用逗号连接，在句子结构上没有问题吗？

14.   Researchers have questioned the use of costly and experimental diagnostic tests to identify food allergies, such as milk, that supposedly disrupt normal behavior.

(A) to identify food allergies, such as

(B) to identify food allergies, like

(C) to identify food allergies, such as to

(D) for identifying food allergies, like that of

(E) for identifying food allergies, such as for

c中such as省略的是什么？为什么是such as to milk的？

27.   A recent study of ancient clay deposits has provided new evidence supporting the theory of global forest fires ignited by a meteorite impact that contributed to the extinction of the dinosaurs and many other creatures some 65 million years ago.

(A) supporting the theory of global forest fires ignited by a meteorite impact that

(B) supporting the theory that global forest fires ignited by a meteorite impact

(C) that supports the theory of global forest fires that were ignited by a meteorite impact and that

(D) in support of the theory that global forest fires were ignited by a meteorite impact and that

(E) of support for the theory of a meteorite impact that ignited global forest fires and

答案是b, d错在哪？两个that从句并列看起来挺好的呀

谢谢！！

7.     Since the 1930’s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.

(A) wings, shaped so smoothly and perfectly

(B) wings, wings so smooth and so perfectly shaped

(C) wings that are shaped so smooth and perfect

(D) wings, shaped in such a smooth and perfect manner

(E) wings, wings having been shaped smoothly and perfectly so

第七题有点难，B其实用的是独立主格；c看上去很象，我一开始就选了c,粗心了，应该用perfectly和过去时,e不简洁，a,d形容aircraft manufacturers，不形容wings,所以错误，

14题选c吗，如果是，我不懂，我选了a

最后一题我的意见是，首先要搞清a meteorite impact 还是 global forest fires contributed to the extinction of the dinosaurs ，我认为是后者，否则说global forest fires ignited by a meteorite impact没有意义，然后我认为用并列句不好，因为不是同一个意思，一个是被导致，一个是导致，你说放在一起合乎逻辑吗。

第七题我也想过是独立主格结构，但是后面有一个that从句，独立主格可以这样用的吗？记得以前学独立主格是n,+分词，很简洁的结构哦

14题是选c

难道是这样的省略吗：

such as (tests) to (identify)milk,NN请指教

偶认为是的。名词+形容词的形式，只是这里用SO...THAT状语从句修饰了形容词。