prep 08 一道题 求解

lttbelief

164.
Mixed with an equal part of water, ethylene glycol, a compound commonly used as an automotive antifreeze, is effective at temperatures as low as –30 degrees Fahrenheit.
A. temperatures as low
B. temperatures so low
C. as low temperatures    at 后面缺宾语
D. as few
E. as little

题目释义:Mixed with …, ethylene glycol, a compound…, is effective at temperature as low as…乙二醇，作为混有同样体积的水的化合物，通常作为汽车防冻剂使用，在低达华氏30度的时候才有效。
考点:
1. 比较结构as adj. a noun. as... ：
as....as之间是可以加 adj+noun的，不过好像只限于几种形式(张振邦)：
as+adj.+不定冠词+单数可数+asI haven't seen as old a car as this for years.
as+adj.+零冠词+不可数名词+as对应 prep2-9 (见类似题链接)
as+adj.+零冠词+复数可数名词+asI don't smoke as expensive cigarettes as those.
2. as adj. (a) noun. as = (a) noun. as adj. as，其中第一个as是adv.
选项分析:
(A) Correct；主语是ethylene glycol，mixed过去分词前置修饰有被动的含义，Mixed的逻辑主语即句子的主语ethylene glycol。a compound 引导同位语从句，Be effective为句子谓语。
(B) so as只用于否定句中。
(C) at后面缺少名词作宾语
(D) at后面缺少名词作宾语；few不能形容温度
(E) at后面缺少名词作宾语；little不能形容温度

类似题链接：
prep 2-9The Environmental Protection Agency frequently puts mandatory controls on toxic substances that present as little risk as one in a million chances to cause cancer.
(A) as little risk as one in a million chances to cause
(B) as little risk as one chance in a million of causing
(C) as little risk as one chance in a million that it will cause
(D) a risk as little as one chance in a million for causing
(E) a risk as little as one chance in a million for it to cause
Key: B
如果D和E改成a risk as little as one chance in a million of causing也就对了

为什么这个类似链接题里面present的宾语可以在as后面，而164题却不能把at的宾语放在as后面呢？

DUKB24

wow

trikcy one


I previously asked the same question in the manhattan


give u the thread


hope it helps
http://www.manhattangmat.com/forums/prep-sc-mixed-with-an-equal-part-of-water-ethylene-glycol-t9998.html

eleven8310

This is what I've found in the Ron's explanation:
more generally, you can't have "as + adj + PLURAL + as...". this construction is only ok if the noun is singular.
e.g.
i have never met as despicable a person as your sister's boyfriend.
or
i have never met a person as despicable as your sister's boyfriend.
both correct

--

i have never met people as despicable as your friends.
--> correct
* BUT *
i have never met as despicable people as your friends.
--> incorrect.

kiwifoodtown

又仔细回顾了以前中学学的语法，说一下自己的理解。

正如LZ总结的as......as中，前面的as 是副词，只能接形容词或副词原级，

但如果要接名词前面必须加不定冠词a(n). 而且名词是可数名词。(这个很关键，我们通过它的排列顺序就可以看出为什么要在名词前加不定冠词了)

以  I haven't seen as old a car as this for years.为例子。顺序是 as+adj+a(n)+noun+as.  这个结构仍然说明as 后只能接形容词或副词原级。I haven't seen as old a car as this for years中的 adj old 应该是针对后一个as后的名词this 作比较，而不是修饰a car, 如果我们一定要认为 old 是修饰 car 的话，那么它应该是 an old car 而不是 old a car. 所以说，说穿了在as......as中，前面的as 是副词，只能接形容词或副词原级。

所以， prep8 164 c 中的 temperatures 是不可以加在第一个 as后的。

但有一个情况是例外的，就是若涉及数量或程度，就可以用LZ总结的 as+adj.+零冠词+不可数名词+as 或 as+adj.+零冠词+复数可数名词+as，  我们知道的就是 as much+不可数名词+as 和as many+复数名词+as 。

在prep 2-9中 little应该是表示 risk的程度的，就如同 much一样。所以 B选项是对的。