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问题 选择题

人体内往往存在着针对一种病毒的不同抗体，合理解释的是[ ]

A．病毒表面往往存在多种蛋白质分子

B．病毒基因在细胞内能高效复制

C．病毒表面往往存在多个同种蛋白质分子

D．病毒基因在细胞内能高效表达

答案

答案：A

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       I am a boy. I am thirteen years old .  I come from England.  I am a student .I have a round face,a big nose ,a small mouth and small eyes .I have a sister . Her name is Amy . She is twelve . She a  student , too. She has a round face , a small nose, a small mouth and big eyes. We are in the same school, but in different grades. We have a nice house and a happy  family.

1. Where does the boy come from ?

                                                       

2. Does the boy have a sister ? 

                                                       

3. How old is the boy's  sister ?  

                                                        

4. How old is the boy?  

                                                        

5. Are the boy and his sister a  student ?   

                                                        

6. Does the boy have a big mouth ? 

                                                         

7. Does the boy's sister have a small mouth ?  

                                                          

8. Are they in the same school ?   

                                                          

9. Are they in the same class ?  

                                                          

10. Do they have a happy family ?  

                                                          
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问答题 简答题

如何区分合理使用与非合理使用计算机软件？
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