求助PREP三道语法题，急盼NN们的指点

为什么没有人理我~~~

139.
   (32262-!-item-!-188;#058&006043)

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

哪位好心人能帮我解答一下这道题为啥选E？

哪位好心人能帮我解答一下这道题为啥选E？

想了好久，先谢过了~

想了好久，先谢过了~

37.   (26417-!-item-!-188;#058&002629)

One report concludes that many schools do not have, or likely to have, enough computers to use them effectively.

(A) or

(B) nor

(C) or are

(D) nor are they

(E) nor are not

50.   (27159-!-item-!-188;#058&003134)

Many teenagers undergo stress, but results of a recent study indicate that the patterns of stress that girls experience are more likely to result in depression than are those that boys experience.

(A) are those that boys experience

(B) what boys experience

(C) boys' experience would

(D) boys' stress patterns do

帮你顶一下吧

139

我觉得C和E都对

但是E是倒装

请教NN