5. For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrowweed supported by posts set in a rectangle.
(A) each a roof of poles and arrowweed
(B) each a roof of poles and arrowweed that are being
(C) with each being a roof of poles and arrowweed
(D) with roofs of poles and arrowweed to be（A）
(E) with roofs of poles and arrowweed that are
答案是 A , 想请教D 和 E 为何错？ 这里的WITH 又是当何种用法？
9. Crises in international diplomacy do not always result from malice; for nations, like individuals, can find themselves locked into difficult positions, unable to back down.
(A) do not always result from malice; for nations, like individuals, can find
(B) do not always results from malice; nations, just as individuals, finding
(C) do not always results from malice; nations, such as individuals, can find
(D) aren’t always the results of malice; nations in the same way that individuals can find（A）
(E) aren’t resulting always from malice; just like individuals who can find
答案：a
虽然其它的答案也都怪怪的，但 A nation前加了 for ，这样句子不就没主词了吗？
11. Since conscious patients often died of shock on the operating table, the invention of anesthesia was essential to the development of surgery as the invention of the propeller was to powered flight.
(A) the invention of anesthesia was essential to the development of surgery as the invention of the propeller was to powered flight
(B) inventing anesthesia was as essential for the development of surgery as the invention of the propeller was for powered flight
(C) the invention of anesthesia was as essential in the development of surgery much as the invention of the propeller had been for powered flight
(D) the invention of anesthesia was as essential to the development of surgery as the invention of the propeller was to powered flight（D）
(E) the invention of anesthesia was essential to the development of surgery, so was the invention of the propeller essential to powered flight
答案；d
请问a为何错？ D 感觉不太平衡，可以麻烦各位高手解释一下 d吗？
不好意思，一下问那么多题，谢谢大家喔
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=22310&page=1
可以找到相应的链接。
5. 我认为each/with都引导独立主格结构，不过(D) with roofs of poles and arrowweed to be和(E) with roofs of poles and arrowweed that are都犯了两个错误，首先D/E都用了with而不是each，后者明确了一对一的关系，即一个shade对应一个roof，而with后用的复数结构无法表达这种对应关系；可能是一个shade有多个roofs，也可能是多个shades有一个roof，或等等；另一方面，D用to be表达的将来，时态不合适；E用了that are supported这样一个繁琐的结构，that are去掉后句子的逻辑和意思都没有改变，所以that are应该去掉。
9. 我只能通过result from来排除其他选项。对于for，我的理解其相当于because作为连词引导句子。但是这种理解有两个问题，1.如果存在这样一个因果关系，for前的分号使用是否合理；2.unable to back down到底是何成分，前面是否应该加上and或其他什么联系结构。所以，这道题还应该请其他人来解释一下。
11. 可能和你理解的相反，D其实是个平行结构：the invention of A was as essential as the invention of B，比较的对象是the invention of A和the invention of B，十分匹配；而A中的as因为没有前面的as对应，所以更象是用来引导一个状语，而不是一个比较结构。
一家之言，欢迎指正！
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