问题 单项选择题 案例分析题

豌豆子叶的黄色(Y),圆粒种子(R)均为显性。让亲本为纯种的黄色圆粒豌豆与绿色皱粒豌豆杂交,分析如下问题:

让F1的黄色圆粒豌豆与绿色皱粒豌豆杂交,子代的性状分离比为()

A.9:3:3:1

B.3:1:3:1

C.1:1:1:1

D.2:2:1:1

答案

参考答案:C

阅读理解

Read and judge. (阅读短文,判断正“T”误“F”。)

Dear John,

     I saw your name in the newspaper. I  would like to be your penfriend.

     I am twelve years old. I live in Shanghai. I study in Pudong Primary School. We study

Chinese, English, maths, science, art, P. E. and some other subjects. My favourite subjects

are P. E. and maths. I like playing basketball with my friends after school. I like collecting

stamps, too. I have a lot of beautiful stamps. I will finish primary school soon and go to

middle school.

     I'd like to know everything about you. Please write to me soon. My e-mail address is

gaoshan@163.com.

     Best wishes!

                                                                                                                         Yours, 

                                                                                                                        Gao Shan

(      )1. Gao Shan knows John's name from the magazine.  

(      )2. The letter is from John to Gao Shan.   

(      )3. Gao Shan's favourite subjects are maths and P. E.  

(      )4. Gao Shan likes collecting stamps and playing football.  

(      )5. Gao Shan doesn't have an e-mail address.

单项选择题 B型题