先天性鳃囊肿和瘘来源于A．鳃弓 B．鳃裂 C．甲状舌管囊肿 D．咽囊 E．胸腺咽管 发布时间：2017-06-12 15:47 │ 来源：www.tikuol.com 题型：单项选择题 问题： 先天性鳃囊肿和瘘来源于A．鳃弓B．鳃裂C．甲状舌管囊肿D．咽囊E．胸腺咽管
题型：单项选择题 完形填空。 When you are going to leam English, you should first pay attention to listening and speaking. It's the groundwork(基础) of reading and writing. You'd better l your best to speak while you are doing much listening. Don't be 2 0f making mistakes. But be careful not to let them stop you from improving your _ 3 . While you are doing this, a good 4 is to keep a diary, write notes or letters.Then if you can, asksome others to go though 5 you have written and they will tell you where it is wrong.Many mistakes in your speaking will be 6 found when you write. Through correcting mistakes, you can do better in learning English. If you are slow in speaking, don't 7 about it. One of the helpful ways is to read-read aloud or read to yourself. The important thing is to choos 8 interesting to read, and it mustn't be too difficult for you. When you are reading 9 this way, don't stop to _10 the new words if you can guess their meanings or when they don't have anything to do with the sentences. But you can do that at some other time.( )1.A. have ( )2.A. sure ( )3.A. English ( )4.A. start ( )5.A.how ( )6.A.happily ( )7.A.talk ( )8.A.something( )9.A．by ( )10.A.look at B. send B. proud B. Chinese B. idea B.when B.easily B.fear B.everything B．on B.look for C. make C. afraid C. JapaneseC. time C.what C.really C.worry C.anything C．at C.look up D. try D. tired D. French D. way D.why D.slowly D.hurry D.nothing D．in D.look over 查看答案
题型：单项选择题 成熟B细胞BCR复合物的成分是（）A.mlg、CD40和CD21B.mlg、CD19和CD21C.mlg、CD79a和CD79βD.mlg、CD80和CD86E.CD19、CD40和CD21 查看答案