搜题请搜索小程序“爱下问搜题”
问题 单项选择题

超敏性血管炎的发病机制主要是（）

A.Ⅳ型变态反应

B.Ⅱ型变态反应

C.Ⅲ型变态反应

D.Ⅰ型变态反应

E.以上都不是

答案

参考答案：C

填空题
选词填空，使句子完整。

who, why, where, what, which, when, how, whose

1. — ______________ are you going to do?  — I'm going to play football.
2. — ______________ are you from?  — I'm from China.
3. — ______________ do you like summer?  — Because I can swim in the pool.
4. — ______________ do they go to work?  — They go to work by taxi.
5. — ______________ season do you like best?  — I like winter.
6. — ______________ do you eat breakfast?  — I eat breakfast at 7: 00.
7. — ______________ is that woman?  — She is my mother.
8. — ______________ jacket is this?  — It's hers.
查看答案
填空题

一个多位数由29个亿、8060个万和350个一组成，这个数写作______．
查看答案