杀鸡在即~~向NN们请教几道旧PREP的语法题~~感激不尽！ - ChaseDream

以下都摘自CD上的07PREP语法笔记，还是有些点不明白，希望有NN能帮我解答~~~
26. (25911-!-item-!-188;#058&002160)
The investigations of many psychologists and anthropologists support the generalization of there being little that is a significant difference in the underlying mental processes manifested by people from different cultures.
(A) of there being little that is a significant difference
(B) of there being little that is significantly different
(C) of little that is significantly different
(D) that there is little that is significantly different
(E) that there is little of significant differences
答案：D 问题：D选项中有两个that，第二个that是什么用法啊？？修饰little的定从吗？little是名词？？？

96. (29707-!-item-!-188;#058&003977)
In some species of cricket, the number of chirps per minute used by the male for attracting femalesrise and fall in accordance with the surrounding temperature, and they can in fact serve as an approximate thermometer.
(A) for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve
(B) for attracting females rises and falls in accordance with the surrounding temperature, which can in fact serve(C) in attracting females rise and fall in accordance with the surrounding temperature, in fact possibly serving
(D) to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve
(E) to attract females rises and falls in accordance with the surrounding temperature, in fact possibly serving

答案：D 问题：D中it没有指代不清的问题吗？不可能理解为指代the surrounding temperature吗？？

138. (32216-!-item-!-188;#058&006031)
According to scientists at the University of Alaska, while the surface temperature of the globe has risen over the last century by about one degree Fahrenheit, the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees.

(A) the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees

(B) the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the thirty years by about five degrees

(C) there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada
(D) it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years

(E) it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees

答案：B 问题：解答中说A中in the previous thirty years应该用过去时，不应该是完成时吗？