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单选题
54.Which of the following sentences is INCORRECT?
A
A.Physics is an important school subject.
B
B.The United States borders Canada.
C
C.The Niagara Falls is in North America.
D
D.Mumps is a kind of infectious disease.
答案解析
正确答案：C
解析：
考察主谓一致。四个选项的主语都是-s 结尾的名词，A 指的是学科名称；B 项美国是表国名的专有名词； D 项的 mumps 腮腺炎， -s 结尾的这个疾病单词看作单数， 其他还有arthritis ， diabetes，phlebitis 等；这三项虽然都是复数形式，但只作单数用，作主语时谓语动词用第三人称单数形式。C 项的尼亚加拉大瀑布，是地理名称，含有不止一个瀑布，类似的还有群岛 the West Indies 、山脉 theHimalayas、海峡the Straits of Gilbraltar、瀑布Falls 等，通常看作复数，故谓语应用复数 are。
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