初二 英语 11 请详细解答,谢谢! (19 17:12:37)

B
第一个是指学生的一些，是复数用 are
第二个是指数量，就是数字，用is

a number of 是指“大量的”,后面的动词是复数形式
the number of 是指“......的数量”，后面的动词是单数形式
选B

具体讲解:
a number of:

许多,若干

例句与用法:
1. I have consulted a number of law books in the British Museums.
我查阅了大英博物馆里许多法律书籍。

2. A number of burglaries have been committed in this area recently.
这一带最近发生了若干起入户盗窃案。

3. A number of soldiers were detached to guard the building.
许多士兵被派去保护这座建筑物。

4. The play contains a number of typical Stoppard set pieces.
这出戏里有若干典型的斯托帕特式的场景.

5. Quite a number of world famous paintings are on show in this exhibition.
有许多的世界名画在本次展览会上展出。

6. The Green Party hopes to put up a number of candidates in the General Election.
绿党希望提出若干候选人参加大选.

7. A number of cables are needed in this project.
这项工程需要大量电缆。

8. The bishop conducted a number of confirmations at the service. <