题目内容
14．In some big cities students under 16 to ride electric bike because it's too dangerous．（ ）| A． | are allowed | B． | aren't allowed | C． | allow | D． | don't allow |
分析 在一些大城市，16岁以下的学生不允许骑电动车，因为太危险．
解答 答案：B
首先根据汉语表述的是一般性的事实，判断用一般现在时，主语 students是动作allow的承受者，所以用被动语态，一般现在时被动语态的构成是：主语+am/is/are+动词的过去分词，另外根据because引导的原因状语从句"太危险"判断，前面的句意是"不允许骑电动车"，主语是复数名词，be动词用are，因为是否定句，所以用aren't，allow的过去分词是allowed，故选B．
点评 本题考查了动词的时态和语态．做题时，一定要特别关注有关的时间短语，这是判断句子时态的标志．
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