奉贤精锐英语老师为你
选B.本题主要考察the number of和a number of的区别.the number of表示“……的数量”,作主语的中心词时,谓语动词用单数形式,要区别于我们同样也很常见的a number of表示”“若干的；许多的”,相当于many或a lot of,起修饰作用,A number of+复数可数名词作主语时,其谓语动词用复数形式,比如：A number of the students are playing football = Many students are playing football.