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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
few/fewer/fewest，many/more/most修饰可数名词；little/less/least，much/more/most修饰不可数名词。
amount+不可数名词：an amount of通常接不可数名词单数，是单数；the amounts of/an amounts of+不可数名词，是复数，如：large amounts of money were……；也有amounts+可数名词复数的情况，如：The amounts of carcinogens……。
number+可数名词：The number of+可数名词复数，是单数；a number of/numbers of+可数名词复数，是复数；the numbers of+可数名词复数，是复数
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