【题目】— You look very cool today, Simon.
— ________.
A. Really? Thank you B. Oh, I don’t think so
C. The same to you D. No. I am not cool at all
科目:初中英语 来源: 题型:
【题目】—I went to your house last night, but no one was in.
—I ____ speaking English with my friends in the school at that time .
A. practiced B. was practicing
C. have practiced D. am practicing
查看答案和解析>>
科目:初中英语 来源: 题型:
【题目】 --- Can you _____ it in English?
--- Yes, I can. It’s a ruler.
A. say B. ask C. think D. thank
查看答案和解析>>
科目:初中英语 来源: 题型:
【题目】— In addition, you and I have lots of things in common.
— I really can't agree more.
A.However
B.Besides
C.At last
查看答案和解析>>
科目:初中英语 来源: 题型:
【题目】The famous soccer star Shang hai last night.
A.reached to B.got C.arrived in
查看答案和解析>>
科目:初中英语 来源: 题型:
【题目】- I really can't believe such a learned man has made so silly a mistake.
- Don't you know_______ sense is worth more than knowledge?
A. general B. unusual C. special D. common
查看答案和解析>>
科目:初中英语 来源: 题型:
【题目】 进入初三后,面对新学科的加入、冲刺中考的压力,同学们的学习任务倍增。繁重的 学业压力下,良好的学习习惯是提高学习效率的制胜法宝。请以“How to develop good learning habits”为题写一篇英语小短文,向同学们提出养成良好学习习惯的建议。写作要点及要求:你是如何做的?这样做的结果如何?你的感受是什么?
1.语法正确,语句通顺,书写规范;
2.文中不得出现真实的人名、校名。
3.不少于100词,标题己给出,不计入总字数
How to develop good learning habits
查看答案和解析>>
科目:初中英语 来源: 题型:
【题目】
Many objects in the universe are invisible,but they send radio waves. The radio telescope thus appeared, and it is considered one of the greatest inventions in the twentieth century. Reber built the world's first radio telescope in 1937. Ryle and Hewish developed radio telescope systems for the location of weak radio sources, and they shared the Nobel Prize for Physics in 1974.
A radio telescope is usually made up of:
One or more antennas to collect the radio waves. Most antennas are made in the shape of a dish to collect and reflect, the radio waves to the sub-reflector, in the same way as a curved mirror focuses visible light to one point.
A receiver and amplifier to receive the radio waves from the sub-reflector, and make these weak radio waves strong enough to be recorded and turned into electronic signals. To make an amplifier sensitive enough, it is usually cooled to, very low temperatures (e. g. as low as -270℃).
A recorder to keep a record of the electronic signals. Most :radio telescopes today keep the signals to the computer's memory disk for astronomers to analyze later.
Radio wavelengths are much longer than those of visible light, and the radio waves from deep space are always weak. To catch Radio wavelengths are much longer than those of visible light,and the radio waves from deep space are always weak. To catch these waves, radio telescopes usually have huge antennas. The sizes of most antennas in use today are around 50 to 300 metres in diameter. The antenna of FAST in Guizhou, China, the latest and largest radio telescope in the world, is 500 metres in diameter, as large as the size of 30 football fields.
To avoid interferences, and keep the telescopes sensitive, radio telescopes are built in places where there are no human radio waves or electronic signals. For example, FAST is 5 kilometres away from the closest village and 25 kilometres away from the nearest town.
Radio telescopes create pictures of the sky, not in visible light, but in radio waves. This is extremely useful, because there are objects that can't be seen, objects that we wouldn't even know without radio telescopes.
【1】Radio telescopes help collect ____________ from the universe
A. lightB. objectsC. radio wavesD. visible signals
【2】Most antennas of radio telescopes are made in the shape of a dish to ____________.
A. make the antennas strong enough
B. increase the number of radio waves
C. turn radio waves into electronic signals
D. focus radio waves on the sub-reflector
【3】The underlined word "interferences" in the passage refers to __________________.
A. the noises made by villagers and animals
B. the sounds from the radios and televisions
C. the people who go to Guizhou to watch FAST work
D. the radio waves and electronic signals from humans
【4】What have we done with the help of radio telescopes?
A. We have received pictures of deep space.
B. We have discovered unknown lives in the universe.
C. We have found some unknown objects in the universe.
D. We have turned the radio waves from space into light.
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com