搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

IgG的亚类有（）

A.IgG1

B.IgG1，IgG2

C.IgG1，IgG2，IgG3

D.IgG1，IgG2，IgG3，IgG4

E.IgG1，IgG2，IgG3，IgG4，IgG5

答案

参考答案：D

填空题

Here is my idea about how a friend is like. Firstly, 61.______a friend is someone you can share your secrets. If you 62.______tell him a secret, never will he talks about it with anybody 63.______else. Besides, a friend is always good listener when you 64.______need one. After hear your sad stories, he will say some 65.______words that is nice and warm. Still, your happiness makes 66.______him happily, too. What’s more, a good friend is willing to 67.______offer the help to which you need, or can at least give you 68.______some advices. In a word, friends are those you like and 69.______trust, and you will enjoy every minute that you spent with 70.______them.

63().
查看答案
单项选择题

趋势研究是( )

A．对同一时期、同一类型的研究对象随时间推移而发生的变化的研究

B．对同一批研究对象随时间推移而发生变化的研究

C．对某种社会现象随时间推移而发生变化的研究

D．对某种社会现象的发展趋势而做出的预测
查看答案