题目列表(包括答案和解析)
Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last
winter, they saw that the litmus paper didn’t turn very blue with base matter.
It'
s
hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!
"It's our first scientific journey, Huang said, "But it makes me want to try harder."
1. Whom did the three kids want to challenge?
A. Their chemistry teacher. B. Their headmaster.
C. Robert Boyle D. Thomas Edison
2. From the text, a red cabbage is a kind of ____.
A. plant B. animal C. paper D. liquid
3.What is widely used as the acid-base indicator now?
A. red cabbage B. litmus paper
C. any plant D. any flower
4.The story mainly tells us ____.
A. how to make litmus paper B. about the three kids' spirit
C. scientists were wrong D. the kids are heroes
The Bermuda Triangle(百慕大三角)is in the Atlantic Ocean, near Florida in the USA. During the past 60 years, more than 1,000 seamen in ships and pilots in planes have lost their lives. It is known as “The Triangle of Death”for its strange seawater and sudden storms. What's the strangest is the light of the seawater, which looks so bright that it can be seen even from an outer spaceship.
At 2:00p.m. on Dec. 5, 1945, five planes took off in fine weather from the airport of Florida, on a training task. Two hours later, the leader in the sky radioed that he was “completely lost”. Then there was silence. Another plane was sent to look for them and also disappeared.
One of the largest ship that had disappeared in the triangle was an American coal ship, 500meters long. The weather was good, and there were no messages for help before it was “gone”. No broken ships or dead bodies have been found so far.
No one is able to tell how all these accidents have happened. A group of Japanese scientists were there to see what it was really like in 1995, but nothing has been heard of them ever since.
1. What is the passage mainly about?
A. How the Bermuda Triangle ate up the planes and ships.
B. Why many of the planes and ships have disappeared.
C. Strange accidents happened in the Bermuda Triangle, no one can tell why
D. When the Bermuda Triangle was formed very strangely.
2. How many planes had lost in December 1945?
A. Five. B. Six. C. Seven. D. Eight.
3. What does the underline word “radioed” mean?
A. Wrote sound message using a radio.
B. Listened to sound message using a radio.
C. Sent sound message using a radio.
D. Received sound message using a radio.
4. Why was the leader in the plane lost?
A. He met with terrible weather.
B. He was losing the right direction.
C. Airport didn't give him an answer.
D. The reasons are still unknown.
5. What about the group of Japanese scientists who went to Bermuda?
A. They have also disappeared very strangely.
B. They have not heard of anything important.
C. They are still working hard in Bermuda.
D. They've come back, knowing nothing about it.
1. If you want to have a guitar lesson, you may .
A. call Susan at 7328059 B. surf the website: www.music.com.au
C. telephone Mr. White at 5132683 D. e-mail
2.Who is the owner of the lost dog?
A. Mr. White. B. Larry. C. Susan. D. David.
3. If you want the job as a taxi driver, you should .
A. master at least three languages B. know the city very well
C. be an experienced driver D. both B and C
4. Which information about the apartment is not mentioned in the table?
A. It has a beautiful view. B. It has hot water in the daytime.
C. It has three floors. D. It has a kitchen.
5. How can you contact the owner of the apartment for more information?
A. By sending an e-mail. B. By going to visit it.
C. By making a phone call. D. By sending a fax.
按所给的汉语,用英语完成下列句子,并将答案写在标有题号的横线上。(本大题共6小题,每小题1.5分,共9分)
1.今年冯小刚执导的春晚将会像往常一样在除夕之夜现场直播。
This year’s Spring Gala directed by Feng Xiaogang _____________________________as usual on New Year’s Eve.
2.他问我会议开始多久了。
He asked me_______________________________________
3.当事情超越我们的控制时,我们该向大人求助。
We should ask adults for help when things __________________________
4.如果我们每个人致力于自己的学习工作,我们的中国梦才会实现。
If we all _________________________________ our own study and work, our nation's dream will come true soon.
5.电视节目“爸爸去哪儿”给电视观众们提供了一个近距离观察明星和他们的孩子们的机会。
The TV program Where Are We Going, Dad? provides the viewers with ______________________________ some famous people and their children.
6.当我们知道了发生在他身上的事情,大家都沉默了。
When we got to know ______________________________________, all of us fell into silence.
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