搜题请搜索小程序“爱下问搜题”
问题 单项选择题

在基因工程中，科学家所用的“剪刀”、“针线”和“运载体”分别是指（）

A.大肠杆菌病毒、质粒、DNA连接酶

B.噬菌体、质粒、DNA连接酶

C.DNA限制酶、RNA连接酶、质粒

D.DNA限制酶、DNA连接酶、质粒

答案

参考答案：D

完形填空
完形填空。
       She is a(n)   1   girl.   2   name is Lingling.    3   is thirteen years now. She's    4   No.10
Middle school. She is in   5  . She has a good friend at school. He's name is Jim. He is   6   American
boy.   7   eleven. He is in No.3 Middle school,   8  . Mrs. Zhang is   9    English teacher. She is a 
  10   teacher.
( )1. A. Chinese            
(     )2. A. His                
(     )3. A. He                 
(     )4. A. on                 
(     )5. A. Class Two, grade one
(     )6. A. a                  
(     )7. A. His                
(     )8. A. too                
(     )9. A. their              
(     )10. A. very               
B. English             
B. She's               
B. She                 
B. /                   
B. Grade One, Class Two
B. an                  
B. Her                 
B. and                 
B. they                
B. very good           
C. American           
C. He's               
C. We                 
C. a                  
C. Class Two, Grade One
C. /                  
C. He's               
C. teacher            
C. my                 
C. right              
D. Japanese           
D. Her                
D. I                  
D. in                 
D. grade one, class two
D. the                
D. She's              
D. student            
D. your               
D. old                
查看答案
选择题

甲午中中战争对中国产生了许多严重的影响，这其中包括

①台湾与祖国分离五十年 ②列强的侵略势力从此由沿海深入到中国的内地

③直接刺激了列强对中国的瓜分野心 ④中国东北成为沙俄与日本争夺的焦点[ ]

A．①②③④

B．①③④

C．①②④

D．①②③

查看答案