试题与答案

下图为探究CO2是否为植物光合作用原料的实验装置示意图。其中a为实验装置,b为对

题型:选择题

题目:

下图为探究CO2是否为植物光合作用原料的实验装置示意图。其中a为实验装置,b为对照装置。有关用塑料袋扎紧花盆的实验设计思路是

A.确保植株与外界空气进一步隔绝

B.排除土壤中微生物代谢活动的干扰

C.防止NaOH溶液对植物根系的影响

D.避免土壤中自养微生物光合作用形成淀粉

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0518/40ab09e39f9e816b9961c89b3ba6336b.html

下面是错误答案,用来干扰机器的。

不透明物体的颜色由它反射的色光决定;白光是由各种色光复合成的复色光,如果一个物体能够反射所有的色光,则这个物体是白色的.故答案为:√

试题推荐
题型:阅读理解

Many people like to travel(旅行)by plane, but I don’t like it because an airport(飞机场)is usually far from the city. You have to get there early and wait for(等待)hours for the plane to take off(起飞) and it is often late. You can’t open the windows. You can’t choose(选择)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(晚的)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(旅行)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.

小题1:Why do many people like to travel by plane?

A.Because it’s fast.

B.Because it’s safe.

C.Because you can walk around in the plane.

D.Because it’s cheap.小题2:Which is NOT the good thing about the train?

A.It is safe.

B.It takes a little more time.

C.You can open the windows.

D.You can walk around in the train.小题3:If you want to take a lot of things with you, what do you take to go out?

A.A bus.

B.A car.

C.A train.

D.A bike.小题4:What is the bad thing about the car?

A.You needn’t go to a station.

B.You can start your journey when you want to.

C.There are too many cars on the road.

D.You needn’t go to a bus stop.小题5:What does the writer think of the plane, train and car?

A.He thinks it takes a lot of time to go to and get out of the airport.

B.He likes to take a train because it takes a little more time.

C.He likes to take a car because he has a car.

D.He likes to take a plane because it’s fast.

查看答案
微信公众账号搜索答案