Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
I: Read the pasage and answer the questions:
Nylon was invented in the early 1930s by an American chemist, Julian Hill. Other scientists worked with his invention and finally on 27 October 1938, nylon was introduced to the world. It was cheap and strong and immediately became successful, especially in the making of ladies’ stockings.
During the Second World War, the best present for many women was a pair of nylon stockings, but more importantly, it was used to make parachutes and tyres. Today, nylon is found in many things: carpets, ropes, seat belts, furniture, computers, and even spare parts of human body. It has played an important part in our lives for over 50 years. Next year, about 36 million tons of it will be manufactured.
1. Who iss Julian Hill ?
=>Julian Hill who invented Nylon in the early 1930s
2. When ứa nylon first introduced to the world ?
=>on 27 October 1938
3. What do they use nylon for ?
=>they use nylon for carpets, ropes, seat belts, furniture, computers, and even spare parts of human body.
4. What is 'it' in the last sentence replaced for?
=>It is Nylon
Giup voi a
Read the text on the tight about the invention of semaphore. Five sentences have been removed. Choose from sentences A-F the one which fits each gap (l-4).There is one extra sentence which you do not need. There is an example at the beginning (0).
A Using ropes, these could be moved to form 49 different shapes that could be recognized easily.
B The main problem was that it could not be used during the night or on foggy days.
C These messages could be sent very quickly.
D The new republic faced enemies on all sides in the form of the forces of Britain, Austria, Holland, Prussia and Spain.
E In August 1794, it carried its first message, the news of Napoleon's victory at Le Quenoy.
F A system was built between London and the south coast, and other countries followed.
War has been called 'the mother of invention', and this was certainly true in the French Revolutionary wars in 1792. 1 | D | What the Revolutionary Government urgently needed was a reliable system of communication.
Claude Chappe, who was a priest and an engineer, had developed a telegraph system, but had not been able to test it fully. However, his brother Ignace was a member of the government, and arranged for Claude's system to be tested. It turned out to be a great success and started a new form of high-speed communication.
The two brothers had a series of towers built 5 to 10 km apart. At the top of each tower was a tall wooden mast, and they attached one horizontal and two vertical wooden beams to this mast. Claude called this system 'semaphore', which comes from the Greek meaning 'bearing a sign'. 2 (A )
Operators in each tower watched neighbouring towers through a telescope and then passed the message on to the next one in the line. The first line stretched from Paris to Lille, a distance of 2.40 km. 3 ( C). At an average speed of three signals a minute, it was carried in 20 minutes, more than 90 times faster than messengers on horseback.
Once the value of Chappe's system was understood, it soon became the standard method of communication in Europe. 4 (F ). By the time the electric telegraph was developed, France had more than 550 semaphore towers stretching 4,800km.
Unfortunately, Chappe's system had some disadvantages. 5 ( B) The towers were also expensive to maintain and the cost of staff was high. In the end, Chappe was depressed by these criticisms of his inventions and by claims from other engineers that they had invented semaphore, and he committed suicide in 1805.
Read the text on the tight about the invention of semaphore. Five sentences have been removed. Choose from sentences A-F the one which fits each gap (l-4).There is one extra sentence which you do not need. There is an example at the beginning (0).
A Using ropes, these could be moved to form 49 different shapes that could be recognized easily.
B The main problem was that it could not be used during the night or on foggy days.
C These messages could be sent very quickly.
D The new republic faced enemies on all sides in the form of the forces of Britain, Austria, Holland, Prussia and Spain.
E In August 1794, it carried its first message, the news of Napoleon's victory at Le Quenoy.
F A system was built between London and the south coast, and other countries followed.
War has been called 'the mother of invention', and this was certainly true in the French Revolutionary wars in 1792. 1 | D | What the Revolutionary Government urgently needed was a reliable system of communication.
Claude Chappe, who was a priest and an engineer, had developed a telegraph system, but had not been able to test it fully. However, his brother Ignace was a member of the government, and arranged for Claude's system to be tested. It turned out to be a great success and started a new form of high-speed communication.
The two brothers had a series of towers built 5 to 10 km apart. At the top of each tower was a tall wooden mast, and they attached one horizontal and two vertical wooden beams to this mast. Claude called this system 'semaphore', which comes from the Greek meaning 'bearing a sign'. 2 (A )
Operators in each tower watched neighbouring towers through a telescope and then passed the message on to the next one in the line. The first line stretched from Paris to Lille, a distance of 2.40 km. 3 ( C). At an average speed of three signals a minute, it was carried in 20 minutes, more than 90 times faster than messengers on horseback.
Once the value of Chappe's system was understood, it soon became the standard method of communication in Europe. 4 (F ). By the time the electric telegraph was developed, France had more than 550 semaphore towers stretching 4,800km.
Unfortunately, Chappe's system had some disadvantages. 5 (B ) The towers were also expensive to maintain and the cost of staff was high. In the end, Chappe was depressed by these criticisms of his inventions and by claims from other engineers that they had invented semaphore, and he committed suicide in 1805.
One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visiting an institute which was looking into the way dolphins communicate with each other. He was standing at the edge of one of tanks where several of these highly intelligent, friendly creatures were kept. Elvar had just swum up alongside him and had turned on his back. He wanted Sagan to scratch his stomach again, as the astronomer had done twice before. But this time Elvar was too deep in the water for Sagan to reach him. Elvar looked up at Sagan, waiting. Then, after a minute or so, the dolphin leapt up through the water into the air and made a sound just like the words "More!"
The astonished astronomer went to the director of the institute and told him about the incident.
"Oh, yes. That´s one of the words he knows," the director said, showing no surprise at all.
Dolphins have bigger brains in proportion to their body size than humans have, and it has been known for a long time that they can make a number of sounds. What is more, these sounds seem to have different functions, such as warning each other of danger. Sound travels much faster and further in water than it does in air. That is why the parts of the brain that deal with sound are much better developed in dolphins than in humans. But can it be said that dolphins have a "language", in the real sense of the word? Scientist don´t agree on this.
1/ The dolphin leapt into the air because
A. Sagan was too near the water
B. it was part of the game they were playing.
C. he wanted Sagan to scratch him again
D. Sagan wanted to communicate with him
2/ "Dolphins" brains are particularly well developed to
A. help them to travle fast in water
B. arrange sounds in different structures
C. respond to different kinds of sound
D. communicate with humans through sound
B. Use the words given in capitals at the end of each sentence to form a word that fits in the space.
1. The first inhabitants of Iceland were a group of _Norwegian_ families who settled on the island in AD 874. NORWAY
2. There was disagreement about whether the country needs to maintain a _deterence_. DETER
3. Hundreds of _ evacuees_ from the war zone have arrived in the city and we are trying to find homes for them. EVACUATE
4. _Bedridden patients are often given exercises to help prevent their muscles from becoming stiff. BED
5. It was this passion for fast cars that led to his _untimely_ death at the age of 33. TIME
6. Every effort is made to _rectify_ any errors before the book is printed. RIGHT
7. In a recent opinion poll, a majority of _respondents__ were against nuclear weapons. RESPONSE
8. Her mouth is _seductively__ lipsticked and her eyes are wide open with anticipation. SEDUCE
9. The script has a refreshing _spontaneity_ and sparkle. SPONTANEOUS
10. It’s better to be an _omnivore_ and eat a variety of plant and animals in case there is a shortage of one particular kind of food.
Điền từ còn thiếu:
Nowadays more and more people are changing the way they use their televisions..Some years ago we used to turn on Tv and watch whatever there was.But now we choose the programs we watch much more carefully because we have many other interesting things to do.One result of this change is that we are also becoming more careful about the actual television set itself. As we watch fewer programs, we want to be sure that we will have a really good picture, with bright color and clear sound. Because it will be switched off most of the time, we also want the television to look good when we are not watching it. So when we buy or rent we look at the outside to make sure it is attractive and will look right with other furniture.Of course we have to pay more for high quality.However it seems that the number of people who are content to do is increasing and this should have a good result because in the end all television will have better quality
Nowasday, more and more people are changing the way they use their televisons.Some years ago, we.....used ........ to turn on TV and watch whatever there was. But now we choose the programs we watch........whatever....... more carefully because we have many.......other......... intersteing things to do. One result of this change is that we are also becoming ....more.......... careful about the actual television set itself. As we watch fewer programs, we want to be sure that we will be switched off....most....... of the time, we also ưant TV to look good when we are not watching it. So when we.....buy......... or rent we look at the outside to make sure it is attractive and will look right.......with.......... other furniture. Of course, we have to pay more..........for... high quality. However, it seems that the number of people.......who....... are content to to so is increasing, and this should have a good result, because in the end all television will have better quality.
1. The word "telephone" means hearing the sounds produced at a distance
2. By Alexander Gragam Bell
3. More thanone hundred years ago
4. Because it makes us possible to talk to our friends far away without all they way to their homes.
5. Yes they do
Circle the best alternative
If you ask anyone who (9) ............television, they will tell you that it was John Logie Baird. Of course, Baird was an extremely important personality in the history of television, but it would be more (10)_________ to see his role as part of a chain of events which finally led to television as we know it today. The history of television really begins in 1817 with the (11) ............. of the chemical selenium by Berzelius, a Swedish chemist. It was found that the amount of electric current that selenium could carry (12) ................. on how much light struck it. Then, G.R. Carey, who was an American inventor, (13)____________ with the first real television system in 1875. His system used selenium to (14) ................... picture to a row of light bulbs. However, this picture was not very clear. Over the next few years, a number of scientists and inventors simplified and (15) ................... Carey’s system. In 1923, Baird made the first practical transmission
9) A. invented B. found C. noticed D. conceived
10) A. real B accurate C particular D specific
11) A. evidence B discovery C sighting D encounter
12) A. called B sent C depended D turned
13) A. checked up B brought up C broke up D came up
14 A push B eliminate C transmit D delay
15 A improved B arranged C multiplied D analysed