求求求prep-sc两道题！急

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On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.

(A) On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow

(B) On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth

(C) On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles

(D) Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate

(E) Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow

答案选E，为什么？E中谓语动词不应该是复数吗？

The computer company has announced that it will purchase the color-printing division部门 of a rival company for $950 million, which is part of a deal that will make it the largest manufacturer in the office color-printing market.

(A) million, which is part of a deal that will make

(B) million, a part of a deal that makes

(C) million, part of a deal making

(D) million as a part of a deal to make
                

(E) million as part of a deal that will make 

答案选E，请亲们给讲讲为什么。

为什么D中的to make错了，还有a part of...和 part of...有什么区别吗？

小女在此跪谢！！！

亲们帮帮忙哈！

那极品童鞋，你的意思是among这个句子倒装了，is的单复其实要看后面的the rate？这题出的还挺绕人

那后面那道有思路么？跪求啊~~~O(∩_∩)O~

哈哈 原来极品GG也是同问这道part的题哈，希望牛人们来解救我们！哈哈

我说一下自己的想法，大家指正呀

第二题，D选项的话，加to make后省略，得主干

it will purchase (......)  to make it the largest manufacturer in the office color-printing market.

因为to 有目的的意思，就是买了xx，为了把它变成大公司，改变原意

E选项的话，a deal that will make ，that从句是修饰deal的，不该原意

第一题为什么C不对呀