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题库 / Prep2008E2-SC-185
When drive-ins were at the height of their popularity in the late 1950s, some 4,000 existed in the United States, but today there are less than one-quarter that many.
there are less than one-quarter that many
there are fewer than one-quarter as many
there are fewer than one-quarter of that amount
the number is less than one-quarter the amount
it is less than one-quarter of that amount
请看讲解视频
less不可数名词 salt, love, money
fewer可数 ingredients, dollars, people =>排除 a d e
GMAT里面AMOUNT的用法解释是：amount is for undifferentiated masses such as sand or water，
因为4000 drive-ins是4000个不同的个体所以that amount不可以修饰4000.
that amount是指some 4000, 可是amount是代表不可数名词, some 4000是可数名词
as many意思为同样数量的
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