Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

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问题 Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

选项 A、is equal to
B、equal
C、equals to
D、is equal

答案A

解析 语法结构题。本句的难点是:be equal to意为“与…相等”,等于及物动词equal。任at which引导的定语从句中,主语为第三人称单数,而B 项equal又没有词尾s,C 和D 两项的形式又不正确,所以A 项正确,因其既合语法也合句意。本句的意思是:物价应在供求量相等的水平上达到平衡。
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