Which of the following sentences is INCORRECT?

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问题 Which of the following sentences is INCORRECT?

选项 A、Physics is an important school subject.
B、The United States borders Canada.
C、The Niagara Falls is in North America.
D、Mumps is a kind of infectious disease.

答案C

解析 四个句子的主语都是有-s的名词,本句考查主谓一致。A中的physics是学科名称,B中的The UnitedStates是表国名的专有名词,D中的Mumps“腮腺炎”是一种疾病名称,这三个词虽然都是复数形式,但只作单数用,作主语时谓语动词用单数形式,这三项都正确。C中的The Niagara Falls“尼亚加拉大瀑布”是地理名称,含有不止一个瀑布,通常作复数用,谓语要用复数,故C项错误,为本题答案。
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