补充85、86

补充85 According to the United States Air Force officials, a cannon shooting dead chichens at airplanes has proved helpful to demonstrate what kind of damage can result when jets fly into a flock of large birds.

e) that shoots dead chickens at airplanes has proved helpful in demonstrating.

正确答案为E，我认为若E则表示大炮已经证明，和原文意思不符，若A选项把to demonstrate 改成in demonstrating是否就对了

补充86 In his eagerness to find a city worthy of Priam ,the German archaeologist schliemann cut through Troy and uncovered a civilization a thousand years older as was the city Homer's heroes knew.

正确答案 b:但我认为平行结构的前半部分是civilization后面是city不构成并列关系。？？？？

85 - help to do / help do / helpful in doing 都是习惯用法

86 - In his eagerness to find a city worthy of Priam, the German archaeologist Schliemann cut through Troy and uncovered a civilization a thousand years older as was the city Homer’s heroes knew.

(A) older as was the city Homer’s heroes knew

(B) more ancient than the city known to Homer’s heroes

(C) older than was the city known to Homer’s heroes

(D) more ancient of a city than Homer’s heroes knew（B）

(E) older of a city than was the one known to Homer’s heroes

比较的是年代，和东西本身没有关系；比如：这棵数比这条路早出现在这里。

顺便建议你以后发贴时将题目贴全，谢谢！

谢谢