颈内、外动脉分叉处的正确部位是A．胸锁乳突肌中点处软骨环处 B

搜题请搜索小程序“爱下问搜题”

问题单项选择题

颈内、外动脉分叉处的正确部位是

A．胸锁乳突肌中点处软骨环处

B．平锁骨水平

C．颌下腺上缘处

D．甲状软骨上缘处

E．第四气管

答案

参考答案：D

解析：颈总动脉在甲状软骨上缘分为颈内、颈外动脉。

补全对话，情景问答

根据语境填入适当的短语或句子，补全对话。

A: It's time for dinner! __1__. Don't you want it?

B: Fish and chips again! __2__.

A: Why do you say so? It used to be your favorite meal, right?

B: __3__, but I have had fish and chips three times a week.

A: Three times a week! You haven't had it for over a week.

B: But, can I have something else __4__?

A: Well, in that case you'd better go and cook your own supper.

B: Then I'll __5__.

问答题

射到凸透镜的入射光线如图所示，F为焦点．试画出通过凸透镜的折射光线．