9．已知一玉米植株的基因型为AABB,周围虽生长有其它基因型的玉米植株,但其子代不可能出现的基因型是

A、AABB 　　　　　　B、AABb　　 　 　C、aaBb 　　　 　　D、AaBb

8．已知A与a、B与b、C与c 3对等位基因自由组合，基因型分别为AaBbCc、AabbCc的两个体进行杂交。下列关于杂交后代的推测，正确的是

A．表现型有8种，AaBbCc个体的比例为1/16

　 　B．表现型有4种，aaBbcc个体的比例为1/16

C．表现型有8种，Aabbcc个体的比例为1/8

D．表现型有8种，aaBbCc个体的比例为1/16

7．用豌豆进行遗传试验时，下列操作错误的是

A．杂交时，须在开花前除去母本的雄蕊　　　　　 B．自交时，雌蕊和雄蕊都无需除去

C．杂交时，须在开花前除去母本的雌蕊　　　　　 D．人工授粉后，应套袋

6．两株高茎豌豆杂交，后代高茎和矮茎的比例如右图所示，则亲本的基因型为

A．GG×gg　　　 　　　　　B．GG×Gg　　

C．Gg×Gg　　　 　　　　　D．gg×gg

5．在生物的遗传中，不遵循孟德尔遗传规律的生物是

A．大肠杆菌　　 　 B．水绵　 　　　　 C．小麦　　 　　 D．玉米

4．下列表示纯合子的基因型是

A．AaX^HX^H　　　　　 B．AABb　　　　 C．AAX^HX^H　　　　 D．aaX^HX^h

3．家兔皮下脂肪，白色对黄色为显性。将纯种白色脂肪家兔与黄色脂肪家兔杂交，仔兔喂以含叶绿素的饲料时，仔兔的皮下脂肪为黄色，否则仔兔的皮下脂肪为白色。这种现象说明

A．基因型相同，表现型一定相同　　　　 B．基因型相同，表现型一定不相同

C．表现型相同，基因型一定相同　　　　 D．表现型受基因型与环境条件共同作用

2．孟德尔在研究豌豆一对相对性状的遗传时，设计了对现象解释的验证实验，在遗传学上称为　

　A．测交　　　 　　B．杂交　　　 　　　C．自交　　 　　　　　D．正交

1．下列性状中，不属于相对性状的是

A．高鼻梁与塌鼻梁　　 B．卷发与直发　　　 C．五指与多指　　　　 D．眼大与眼角上翘

第二节(共25小题，每小题1分，满分25分)

听下面对话或独白，每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并涂在答题卡上相应的位置。每段对话或独白读三遍。

听第6段材料，回答第6-7题。

M: Hello, Wang Mei!

W: Hello, Bill!

M: What kind of TV programs do you like best?

W: I like watching programs about music. These days I am watching Happy boys on TV. So fantastic!

M: Why do you like music programs?

W: Because they’re relaxing.

听第7段材料，回答第8-10题。

M: It’s good to see you back. How was your holiday in Beijing?

W: Great. I had a wonderful time there.

M: Did you see the Great Wall?

W: Yes, it’s very beautiful. Here is my picture of the Great Wall.

M: Oh, it’s even more wonderful than I thought. What other places did you visit?

W: Beijing Zoo, Tian’an Men Square and the History Museum.

M: I hope I can visit Beijing next year.

听第8段材料，回答第11-13题 。

M: What’s the matter with you,madam?

W: I have a headache.

M: How long have you been feeling like this?

W: It started the day before yesterday after I swam in the river.

M: And you seem to have a temperature.

W: What should I do?

M: It’s nothing serious. Take few days off from work and stay in bed for a day or two.

W: Is there anything else I should pay attention to?

M: Yes. Drink as much water as you can.

听第9段材料，回答第14-16题。

W: Good morning! Can I help you?

M: Yes, please. I want to buy a pair of trousers.

W: What size do you want?

M: Size L, please.

W: OK! What about this pair?

M: Sorry, I don’t like black. Have you got any other colors?

W: Other colors? Oh,yes. We’ve also got blue, brown and white ones.

M: Can I have a look at the brown trousers?

W: Certainly.

M: How much does each pair cost?

W: 46 dollars.

M: It’s too expensive. Can it be a little cheaper? What about 35?

W: Er… all right.

M: Then I’ll take it.

听第10段材料，回答第17-20题。

At our school, we sometimes have a special day to help others. Last year we went to an old people’s home and sang songs. The old people were very happy. We should be allowed to take time to do things like that more often.

For example, we should visit primary schools and help teach young students. I want to be a teacher when I grow up. So it would be a great experience for me. My friend Peter wants to write for a newspaper. He should be allowed to volunteer at the newspaper office once a week.

听第11段材料，回答第21-25题。

　The first Tree Planting Day was in 1987. Every year,on March 12th,office workers,soldiers,students and old people go out to plant trees.

It was Tree Planting Day last Sunday. Our class went to plant trees. We met at the school gate at seven in the morning. Then we went to a park about five kilometers away from our school by bus. When we arrived, we started to work at once. We worked in pairs. We took turns to dig holes in the ground. It was hard work, but we enjoyed it. When the holes were deep enough, we put the young trees in them, and then filled them again. After that we got some water from a river and watered the trees.

At the end of the day, we had planted over three hundred trees.

听第12段材料，回答第26-30题。

Mr Black lived in a small town, but he worked in a big city. He moved there with his wife and two children last Saturday.

On the next day, Mr Black took his new car out and was washing it when a friend came. The friend stopped and looked at the new car for a minute. Then Mr Black turned and saw him.

The friend said,“That’s a new car. Is it yours?”“Sometimes.”Mr Black answered.

The friend was surprised. “Sometimes?”he said,“What do you mean?”Mr Black answered slowly,“Well,when there’s a party in town,my daughter Linda drives it. When there’s a football game,it’s my son Mike’s turn. When I have washed it and it looks really nice and clean, my wife Susan uses it. And when it needs cleaning, it’s mine.”