Probably you have seen photos of the Grand Canyon , the great valley in the desert country of Arizona. But you must go there yourself to feel its true size and beauty. The Grand Canyon is one of the greatest natural wonders of the world The Colorado River formed the Grand Canyon over millions of years.Slowly,the river cut down through hard rock.At the same time,the land was rising.Today,the canyon is 1.5 kilometres deep and 445 kilometres long.The oldest rocks at the bottom of the canyon are more than 1 billion years old.The width varies from about 200 metres to 29 kilometres across.The rim or top of the canyon is about 2,300 metes above sea level on the South Rim,and about 3,000 metres on the other side,the North Rim.As a result,there are different kinds of plants and animals on opposite sides of the canyon.The South Rim is a dry desert country.The North Rim has tall forests. The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange color1s of the rocks are especially clear and bright. In winter, the canyon is partly covered with snow. The view from the South Rim of the Grand Canyon is the best. Most visitors come here and stay in campgrounds or hotels. Every point along the canyon's edge offers a different view. The North rim of the Canyon is quieter. It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River. On the way, you go through Navado Indian lands, and a color1ful pink desert called "The Painted Desert". If you want to visit the North Rim from the South Rim, you _ . A) can go there in many directions B) won't spend much time on the way C) can visit The Painted Desert on the way D) needn't go across any bridges
C
When you are visiting New York City with kids,there are numerous things to do which will entertain their spirits and feed their minds. *The Whispering Gallery Make your way to the Whispering Gallery. The Whispering Room's architecture allows for a phenomenon that usually sparks a lot of giggles. Once inside the gallery,place one person facing the corner at one end of the room and then place another person facing the corner at the opposite end. Ask one of the participants to whisper a phrase or a quick sentence or two and the person at the opposite end will be able to hear every word that was said. E.42nd St. New York,NY 10017 2127715322 grandcentralterminal.com *American Museum of Natural History The American Museum of Natural History was founded in 1869.In addition to its impressive exhibits,permanent attractions bring the cool feeling to kids. They can enter the Fossil Halls and take in the impressive dinosaur skeletons. And the Milstein Hall of Ocean Life educates kids on the fragility of the ocean. Central Park West at 79th St. New York,NY,10024 212--769--5606 amnh.org *The Scholastic Store Most parents want their children to read,and moreover,to enjoy reading. The Scholastic Store helps to make that wish a reality by publishing engaging,well written stories that appeal to children. With classics such as Clifford the Big Red Dog,The Magic School Bus,and Harry Potter,the Scholastic Store will delight your children. 557 Broadway New York,10012 212--343--6100 scholastic.com *Ellen's Stardust Diner The restaurant is a place where each person in your family can find something to eat .At Ellen's Stardust Diner,a diverse menu will whet everyone's appetite. Arugula salads,grilled cheese,burgers and meatloaf are all on this varied menu. The hall of beauty queens,a drive-in theatre and wait staff that sing to you can add to the unique dining experience. *1650 Broadway,corner of 51st St. *New York,NY 10019 *2129565151 ellensstardustdiner.com In addition to your favorite food in Ellen's Stardust Diner you can also _ . A) make some good friends B) see many beautiful queens C) receive the first--class service D) enjoy some entertaining programs
D
Q: Scientific Progress Most scientific progress is the result of careful consideration of work that has already been done. The wonderful world which lies before us today has been put up by hardworking men with clear heads and inventive mind, and these who follow them along life's road will improve on their efforts. It is sometimes necessary to question and even to disbelieve some of the statements made by experts. Action or experiment can often end an argument or achieve a breakthrough. When men were wondering whether it was possible to reach India by sailing westwards from Europe, and whether there was any land on the other side of the Atlantic Ocean, Christopher Columbus decides to act. He gathered some men, invited them to go on board his three ships, and set out across the dangerous waters of the Atlantic Ocean. He was successful in finding land, but it was not India. The result of his action was that the arguments came to the end. Any young man who wishes to do research must be courageous enough to question old beliefs and do some original thinking about them. Although we seem to know so much, there are many things we don't know. Even when we pull an atom to pieces, we do not really know what the pieces are, we often do not reach the reality behind what we discover, and the more we learn, the better we realize our ignorance. Columbus succeeded in finding out that _ A) the Atlantic was dangerous to get across B) India was to the west of the Atlantic C) There was land on the other side of the Atlantic D) it was possible sail to India by crossing the Atlantic
A: C
(Q).
Since ancient times, people have known about its ability to reduce pain and high body temperature. More than 2000 years ago, the Greek doctor Hippocrates advised his patients to chew on the bark and leaves of the willow. The tree contains a chemical called salicin . From salicin, researchers in the 1800s discovered how to make salicylic acid . And in 1897, a chemist named Felix Hoffmann at Friedrich Bayer and Company in Germany created acetyl salicylic acid. Later it became the active substance in a new medicine that Bayer called aspirin. The "a" came from acetyl. The "spir" came from the spirea plant, which also produces salicin. And the "in" Well, that is a common way to end medicine names. In 1982, a British scientist shared the Nobel Prize in Medicine in part for discovering how aspirin works. Sir John Vane found that aspirin blocks the body from making natural substances called prostaglandins .Prostaglandins have several effects on the body. Some cause pain and the expansion, or swelling( ; ), of damaged tissue. Others protect the lining of the stomach and small intestine. Prostaglandins also make the heart, kidneys and blood vessels work well. But there is a problem. Aspirin works against all prostaglandins, good and bad. Scientists learned how aspirin interferes with an enzyme . One form of this enzyme makes the prostaglandin that causes pain and swelling. Another form of the enzyme creates a protective effect. So aspirin can reduce pain and swelling in damaged tissues. But it can also harm the inside of the stomach and small intestine . What can we know about Prostaglandin according to the passage? A) It results from pain. B) It prevents the lining of the stomach and small intestine. C) It causes blood vessels to work wrongly. D) It is sometimes good but sometimes bad.
(A).
D