搜题请搜索小程序“爱下问搜题”
问题 单项选择题

颅后窝占位病变可引起下列哪种（）

A.幕下疝

B.钩回疝

C.小脑扁桃体疝

D.海马回疝

E.扣带回疝

答案

参考答案：C

解析：颅后窝占位属幕下病变，最容易引起的是小脑扁桃体疝，其他均为幕上病变所引起。

选择题

等比数列前n项和为Sn,有人算得S1="8," S­­2="20," S3="36," S4=65,后来发现有一个数算错了，错误的是（   ）

A．S1

B．S2

C．S­3

D．S4
查看答案
单项选择题

Man: Thank you for your helpful assistance. Otherwise, I'd surely have missed it. The place is so out of the way.Woman: It was a pleasure meeting you. Good-bye.Question: Why does the man thank the woman

A．She promised to help the man.

B．She came a long way to meet the man.

C．She took the man to where he wanted to go.

D．She suggested a way out of the difficulty for the man.
查看答案