问题 单项选择题

离体培养基因型为AaBb的植株产生的花粉粒,其幼苗中基因型为aabb的概率()

A.1/8

B.1/4

C.1/2

D.0

答案

参考答案:D

阅读理解

阅读与回答问题 。  

     Many people like to travel by plane, but I don’t like it because the airport is usually far from the city.

You have to get there early and wait for hours for the plane to take off and it is often late. You can’t open

the windows. You can’t choose the food. Planes are fast, but they still take hours to go out of the airport

and into the city.

     I like traveling by train. I think trains are safe. Railway stations are usually in cities. When you are late

for a train, you can catch another one. You can walk around in the train and open the windows. You can

see many interesting things on your way. I know it takes a little more time. I also like cars. You can start

your journey when you want to, and you don’t need to get to a railway station or a bus stop. Also you can carry many things with you in a car. But sometimes there are too many cars on the road.

1. Why do many people like to travel by plane?

                                                                              

2. What can you do in the train?

                                                                              

3. If you have to take a lot of things with you, how will you travel?

                                                                              

4. What is the bad thing about taking a car?

                                                                              

5. How do you like to travel? And why? ( 请你用一句话回答)

    I like to travel by __________ because ___________________.

选择题