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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
A less 修饰不可数，且用less的话，前面要用there is
B 正确，没选是因为缺少一个as，实际上是省略用法
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。
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