脑底动脉环在脑循环中起着非常重要的作用，能沟通脑前、后、左、_爱下问搜题

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问题单项选择题 A1/A2型题

脑底动脉环在脑循环中起着非常重要的作用，能沟通脑前、后、左、右的血液供应，下列哪条动脉不参与脑底动脉环的组成（）

A.大脑前动脉

B.前交通动脉

C.颈内动脉

D.大脑后动脉

E.椎动脉

答案

参考答案：E

填空题

选用所给词的适当形式完成下列句子或对话。

I, you, we, he, she, they, it, me, us, him, her, my, our, your, his,
its, teachers', Tom's, hers, yours, mine

1、Look, this is        reading room.  It's for          students.  The         are over there near the garden.
2、A:        school bag is here.        is on the desk but where is       ?
     B :        saw        beside       desk but        is not there now.
3、        have a lovely little dog.         name is Huahua.         often play with        at home.
4、A: Mr Green is        English teacher.          is very kind and       all love          .
      B: Yes, and       wife, Mrs Green is a teacher, too.
      A: What subject does        teach, do        know ?
      B: Music. And       like       lessons very much.

解答题

参加跳绳比赛的一共有182人，女生有26人．参加比赛的男生人数是女生人数的多少倍？