第二节

听第6段材料,回答第6、7题

6. Which grade is John in?

A. Senior One.  

B. Senior Two.      

C. Junior Three.

7. What is John’s problem?

A.  The teachers are too strict.  

B.  His classmates are not easy-going.  

C.  The subjects are difficult.

听第7段材料,回答第8、9题。

8. What is Tom busy doing?

A.   Watching TV.   

B.   Playing computer games.     

C.   Chatting on the phone.

9. How long does Tom plan to spend on his vacation homework?

A.    Three days.     

B.  Ten days.             

C.  One week.

听第8段材料,回答第10至12题。

10. Who is the caller?

  A.  David.               

B.  Mr. Smith.            

C.  Helen.

11. How many tickets have been bought?

A.  Two. 

B.  Three.   

C.  Four.

12. When will the movie begin?

A.   At 7:30.

B.   At 8:00.

C.   At 7:00.

听第9段材料,回答第13至16题。

13. What did Li Mei do recently?

A.   She climbed a mountain.     

B.   She visited a village.

C.   She visited her school.

14. What did Li Mei NOT do for the children?

       A. Teach them English.      

    B. Give them money.

    C. Give them school supplies.

15.What do we know about the children?

  A. They were naughty.

  B. They were very shy.

  C. They were hard-working.

16. What do we know about the man?

A . He is seen as an angel.

B. He will not visit those children.

C. He passed his driving test.

听第10段材料,回答17至20题。

17. What is Luke?

A.  A driver.   

B.  A visitor.   

C.  A guide.

18. How long will it take for the bus to get to the hotel?

A.  15 minutes. 

B.  50minutes.  

C.  5 minutes.

19. What is San Jose?

A.  A town.  

B.  A city.    

C.  A beach.

20. What can you do in San Jose, Los Cabos?

A.  Get drunk in public.

B.  Enjoy the fountains. 

C.  Go horse riding.

56、(9分)科研人员以青虾为实验材料研究染色体的形态特征,并对细胞中染色体的数目进行计数。得到如下实验结果,请据此回答问题。

实验一:取出心脏等6种器官组织,分别制成装片,观察和记录分裂期的细胞数目。

结果一:不同器官组织处于分裂期细胞的比例如下图(%)。

 

实验二:分别向青虾腹肌注射0.1mL质量分数的不等的秋水仙素,观察细胞和染色体的形态。

结果二:不同质量分数的秋水仙素处理后,处于有丝分裂中期细胞的比例和染色体形态。

秋水仙素质量分数
0
1×10-3
2×103
3×10-3
4×10-3
5×10-3
6×10-3
有丝分裂中期细胞(%)
1.0
1.2
1.5
3.1
11.2
11.5
12.3
染色体形态
正常
正常
正常
正常
正常
不正常
不正常

实验三:取性成熟青虾的卵巢制成临时装片,观察分裂的细胞。

结果三:观察127个初级卵母细胞,出现不同四分体数目的细胞个数统计

一个细胞的四分体数
48
49
50
51
52
53
54
55
初级卵母细胞个数
1
1
1
7
102
10
3
2

(1)上述6种器官组织中,观察细胞分裂的最佳材料是       ,注射秋水仙素的最佳质量分数是      ,判断依据是                

(2)从统计的角度分析结果三,可以确定青虾体细胞的染色体数为        条,判断的根据是                             

(3)制备青虾染色体标本过程中,还需要使用其他的实验材料,请在下列提供的部分材料中进行选择,并说明其用途。

材料:A.盐酸、酒精;B.纤维素酶;C.胰蛋白酶;D.二苯胺试剂;E.苏丹Ⅲ染液;F.双缩脲试剂;G.醋酸洋红液

①选择                       

用途                        

②选择                        

用途                        

长春外国语学校2010高一下学期第一次月考

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