题目内容
3.Doing experiments can be interesting,and you may try the following experiments at home.Make sure that you'll do them with an adult.34.How many experiments are there in the pictures?C
A.Six.B.Five.C.Three.D.Two.
35.The following are the instructions on how to do"Step 2"in these experiments.Which one is the right order?B
a.Pour 3/4of the water away.b.Put a balloon on the bottle.c.Put the bottle in a bucket of hot water.The air rises into the balloon.
A.a,b,cB.a,c,bC.b,a,cD.c,a,b
36.What can you see in the bottle at last in Experiment A?D
A.Some ice.B.Some water.C.Some ice and water.D.A cloud and some water.
37.What will happen to the balloon in"Step 3"in Experiment C?D
A.It will be bigger.B.It will be broken.
C.It won't change.D.It will be in the bottle.
分析 做实验会很有趣,你可以在家做以下的实验,身边要有大人.
第一个实验:制作自己的云.第一步将塑料瓶装满热水放置五分钟,第二步倒出一部分水,第三步放置一些冰块在瓶口上,第四步等待观察,几分钟后就有云.
第二个实验:空气遇热变化.第一步将气球吹气再将气放掉,将气球放在瓶口,第二步把瓶子放在热水中
第三个实验:空气遇冷变化.第一步将瓶子放在热水中一会,第二步把气球放在瓶子上,第三步将瓶放在冷水中.
解答 34:C.细节理解题.从图片中可以看出,共有ABC三个实验,故选C.
35:B.综合理解题.通过认真看图分析,可以得知.实验A的第二步是倒出一些水,以便于有形成云的足够的空间;实验B的第二步是把瓶子放在热水中,以便于使瓶中的空气遇热上升进入气球;实验C的第二步是把气球放在瓶子上.故选B.
36:D.细节理解题.从实验A的第④步"…there is a cloud"可以看出瓶中产生了云,当然里面还有原来的水.故选D.
37:D.推理判断题.因为"cold air falls"可知,瓶中的空气遇冷要下降,气球也随之下降进入瓶中.故选D.
点评 答题中注意带着问题阅读短文,一般就能顺利找出答题依据.对于不能直接找到根据的问题注意联系上下文,根据短文中心总结出正确答案.
练习册系列答案
相关题目
19.The number of the tigers becoming smaller and smaller because a number of them been killed by the human beings.( )
| A. | are; have | B. | are; has | C. | is; have | D. | is; has |
20.I'm hungry.Mum,I want_____ to eat.( )
| A. | everything | B. | anything | C. | nothing | D. | something |
13.---I phoned you at nine last night,but answered.
---Oh,sorry.I to music on my MP4at that time.( )
---Oh,sorry.I to music on my MP4at that time.( )
| A. | no one,was listening | B. | nobody,listened | ||
| C. | none,would listen |