题目内容
What would happen if you tried to blow a soap bubble in freezing weather? Would it freeze solid(固体) and fall to the ground? Would you have to hit it to break it? These questions happened to me on a cold winter day. It was too cold to play in the snow, but it was a perfect time to experiment with blowing frozen bubbles.
To blow frozen bubbles, I used dishwashing soap and a drop of glycerin(甘油) to make it even better. I chose a place out of the wind, and blew bubbles the same way I always do. I watched to see what would happen. Here’s what I learned.
If the temperature is low enough, the skin of the bubbles frosts over (结霜), becoming cloudy instead of clear. And what about those rainbow swirls(旋转) you see in soap bubbles? The rainbow colors stay even when the bubbles frost, but they don’t swirl anymore. The bubbles still stay in the air. They don’t fall to the ground any faster than they would on a warm summer day.
When these frozen bubbles break, they don’t turn into small water drops as summer bubbles do. They turn into flashing rainbow confetti(碎屑) and move slowly to the ground. Sometimes a frozen bubble will roll across the snow without breaking. If nothing disturbs the bubble, it may stay there for a long time. Sometimes I could catch a bubble and hold it until the heat of my hand made it pop.
I learned another thing about blowing frozen bubbles. It’s so interesting that I want to try it again next year.
1.It is the perfect time to blow frozen bubbles on a ___________day.
A.cold winter B.warm spring C.hot summer D.sunny autumn
2.When the frozen bubbles break, _________.
A.they make a big sound B.they turn into small drops
C.they fall to the ground like rain D.they become rainbow confetti
3.The purpose of the passage is _______.
A.to learn how to do a science experiment
B.to show the experiment of blowing frozen bubbles
C.to discover games that are fun to play in the snow
D.to invent a new kind of soap that makes stronger bubbles
1.A
2.D
3.B
【解析】
试题分析:这篇短文主要介绍了一个在冬季吹肥皂泡的实验,告诉我们在冬季吹肥皂泡会发生什么现象.
1.根据第一段but it was a perfect time to experiment with blowing frozen bubbles.描述,可知选A.
2.根据第四段When these frozen bubbles break, they don’t turn into small water drops as summer bubbles do. They turn into flashing rainbow confetti(碎屑)描述,可知选D.
3.这篇短文主要介绍了一个在冬季吹肥皂泡的实验,告诉我们在冬季吹肥皂泡会发生什么现象,故选B.
考点:科普性说明文阅读
点评:本文浅显易懂,层次分明,学生很容易把握文章中心内容。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。
What would you do if you had _________ dollars ?
A.two millions | B.two millions of |
C.two million of | D.millions of |
Jack worked in a shop that sold clocks. He was always telling Harry 26 a new clock. But Harry, 27 lived next door to Jack, said he didn’t need one.
“ 28 needs a clock,” Jack said. “How do you know when it’s time to get up?”
“My landlord Mr. Smith turns on his radio at seven o’clock and listens 29 the news,” Harry said. “That’s my morning call.”
“Ok. But how do you know when to go to work?”
“By the time I 30 my breakfast, it’s eight o’clock, time to leave for the office. Then I walk there. When I arrive at my office, it’s nice o’clock. That’s 31 time I start work.”
“Ok. But how do you know when it’s time to go home?”
“The factory bell 32 ” Harry told him.
“But how do you know when it’s time to go to bed?”
“The television programs come to end.”
By now Jack was really 33 . “Ok,” he shouted. “Now tell me what would happen 34 you woke up in the middle of the night and wanted to know the time.”
“That’s easy,” Harry said, “I would knock heavily on 35 wall. Then you would shout at me, ‘What are you doing knocking on my wall at three o’clock in the morning?’”
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