many parents fear that websites like myspace and faceback ar

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/04/27 21:20:12

many parents fear that websites like myspace and faceback are a threat,a door open to.
上面的句子中are 的后面为什么是单数a threat,比如当你看到一群鸭子的时候,应该不会说“它们是一只鸭子”吧

解题之前要有个大方向就是英语是个喜欢讲逻辑关系的语言并且要把逻辑关系体现在字里行间,比如有单复数时态变化主谓要一致,这点不像汉语.
myspace and faceback 只是威胁的例子罢了.are 之前虽然是一个以上的事物（myspace and faceback ）但are 后面的threat是对举例的一个概念性的总结,变成概念性的东西了.后面的door也是如此.举再多例还是a threat,你所说的鸭子也可以这么说,比如你怕鸭子,一个鸭子对你来说是威胁,一百个鸭子对你来说也是一种威胁,“威胁”和“鸭子”本不是一个概念,一个是实物一个是抽象概念,不适用用主谓一致原则,理解吗

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