885SEC3，23

littlegirl

23.    According to United States Air Force officials, a cannon shooting dead chickens at airplanes has proved helpful to demonstrate what kind of damage can result when jets fly into a flock of large birds.
(A) shooting dead chickens at airplanes has proved helpful to demonstrate
(B) shooting dead chickens at airplanes has proved itself helpful as a demonstration of
(C) shooting dead chickens at airplanes proves itself helpful as demonstrating
(D) that shoots dead chickens at airplanes proves itself helpful to demonstrate
(E) that shoots dead chickens at airplanes has proved helpful in demonstrating
答案是E，为什么不选A呢？

11.    In the most common procedure for harvesting forage crops such as alfalfa, as much as 20 percent of the leaf and small-stem material, which is the most nutritious of all the parts of the plant, shattered and fell to the ground.
(A) which is the most nutritious of all the parts of the plant, shattered and fell
(B) the most nutritious of all parts of the plant, shatter and fall
(C) the parts of the plant which were most nutritious, will shatter and fall
(D) the most nutritious parts of the plant, shatters and falls
(E) parts of the plant which are the most nutritious, have shattered and fallen

D中为什么用PARTS而不是PART呢？

7.    Many investors base their choice between bonds and stocks on comparing bond yields to the dividends available on common stocks.
(A) between bonds and stocks on comparing bond yields to
(B) among bonds and stocks on comparisons of bond yields to
(C) between bonds and stocks on comparisons of bond yields with
(D) among bonds and stocks on comparing bond yields and
(E) between bonds and stocks on comparing bond yields with
为什么选C不选E？

[此贴子已经被作者于2003-10-10 14:17:16编辑过]

carefield

1.In A, the logical subject of " to demostrate" probably  is " a canon", while " in demostrating" focus the way in which it is helpful.

2.leaf and small-stem material, two parts of a plant

3.comparing emphasizes the action, not the result of such action, as comparison does.
here the point of the sentence needs a result of comparing.

lemonee

对23题也很迷惑，为什么不用has been proved. 而用prove?

第7题，我认为是名词更好.因为comparision 可义表达复数概念。而去og中也多次出现名词优先动名次的。

littlegirl

谢谢两位！

shanghaiwing

Prove 主动形式表示被动意思


The design proved to be a success

hpp920

D中为什么用PARTS而不是PART呢？

我还是不明白.前面用了as much, 指明了the leaf and small-stem material是不可数呀?

请高人指点, 谢了先!!!!!!!!!!11

ysc

大家查查 longman ，helpful in doing sth.

eSpirit

以下是引用ysc在2005-4-16 13:09:00的发言：
大家查查 longman ，helpful in doing sth.

还是这个比较令人信服一些。

amacd

23. According to United States Air Force officials, a cannon shooting dead chickens at airplanes has proved helpful to demonstrate what kind of damage can result when jets fly into a flock of large birds.
(A) shooting dead chickens at airplanes has proved helpful to demonstrate
(B) shooting dead chickens at airplanes has proved itself helpful as a demonstration of
(C) shooting dead chickens at airplanes proves itself helpful as demonstrating
(D) that shoots dead chickens at airplanes proves itself helpful to demonstrate
(E) that shoots dead chickens at airplanes has proved helpful in demonstrating

why "that shoots" not "shooting"?

xxiaoyan

还有一个问题 在b,c,d中的 prove itself helpful 有没有错误？

prove + adj.  与 prove oneself + adj.有区别马？