这题我做过，居然还做错了，捂脸飘走，去找了下正确解析，楼主请见下：
题目释义：when drive-ins were…, 4,000 existed in the United States, but today there are fewer than one-quarter as many.考点比较结构，逻辑表达，句子结构- 4000这个单独的数字不可能existed in the United States，且数字可以做代词，故4000指代了4000 drive-ins，后面要用复数形式的谓语动词。
- amount的用法：GMAT里面AMOUNT的用法解释是：amount is for undifferentiated masses such as sand or water，即amount用于修饰不可分割的物体，即修饰不可数名词，因为4000 drive-ins是4000个不同的个体所以that amount不可以修饰4000.
- 比较。词组：less/fewer than X percent of Y，less或fewer的选用取决于Y是否可数，本题的比较对象是drive-ins。既然全句比较的是可数名词，相应地，需要用are、fewer和many/number等与可数名词复数形式相一致的表述。
- as many的用法(摘自Longman):
as many=a number that is equal to another number ?表示同样的数字 They say the people of Los Angeles speak 12 languages and teach just as many in the schools.
in as many days/weeks/games etc. A great trip! We visited five countries in as many days (=in five days).
*: "twice as many", "one-quarter as many", etc.都是非常常见的用法，记住这样的表达。 选项分析- (A) one quarter加后面的部分应该是一个可数项，而less修饰不可数名词，且用less的话，前面要用there is，故用less错误；that many的表达unidiomatic。
- (B) Correcet；补全省略即there are fewer than one-quarter as many (as there were in the late 1950s)； fewer修饰可数名词正确；one-quarter在此做副词修饰as many，后面不用再加of，类似于twice as many/much as。
- (C) amount修饰不可数名词，不能用来修饰4,000（drive-ins）这个可数的量。
- (D) the number指代不清；the amount指代不清，只能修饰不可数名词；the number is less没有问题，less和smaller都可以修饰数字。
- (E) it没有指代对象，that amount指代4,000 drive-ins错。
补充说明- 关于A选项中的that many还有一种解释：如果是that many，则不能直接跟在副词one-quarter后面，应该在that many前加上of，使得one-quarter作为代词身份出现：one-quarter of of that many。
- D选项不看未划线部分，不考虑指代来说是没有问题的，the number is less than one-quarter the amount. one-quarter做为形容词/限定词来修饰the amount，中间并没有缺少of.但是amount的指向错了:4000 drive-ins是可数的.
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发表于 2013-10-21 16:08:20
