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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
'...some 4,000 existed...' implied 比的应该是#（可数）-> fewer 可数 排除A/D/E
可数# 跟 amount 不能比 【amount->often times 描述不可数object(i.e. liquid...) ] 排除C
思路真清晰
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