How the Grand Canyon was created remains one of the geology's greatest mysteries. Some evidence suggests that the process was a gradual one in which the Colorado River (which runs through the canyon) slowly cut deeper and deeper into the ground over millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead. Down-cutting is when a flood of water rushes over a landscape with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam bursts. Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon. Down-cutting is not just an earthly event. Satellite photos sent back from Mars suggest that the process has happened there, too, say many other researchers. The photos, taken by the Mars Global Surveyor, indicate that an enormous lake existed on Mars 3.5 billion years ago. The lake spilled into a large nearby hole. One edge of the hole broke, releasing a flash flood that quickly carved out a grand canyon. The existence of down-cutting on Mars is just one more piece of evidence that the cold, dry planet was once warm and wet. The passage can be titled as _ . A) Lakes on Earth and Mars B) The Cause of Lake Formation C) The Force of Dam Breaking D) Canyons--Results of Flood Cutting
D
(Question)
Bali is an Indonesian island rich in indigenous culture. A lot of people say that Balinese culture is unique and that the people of Bali have always been content with the "now". If you ask a Balinese person what heaven is like, the probable answer will be "just like Bali". This only goes to show that most Balinese people are happy to be where they are and never worry. One factor that contributes to this laidback lifestyle is the culture of close family ties in Bali. In the Balinese culture, support is always available. Balinese extended families are so tightly knit that all members usually reside in the same complex. Balinese culture is based on a form of this religion, which is called "Hindu Darma". This religion reached the island during the eleventh century. Most of the family customs and traditions as well as community lifestyles of the Balinese people are influenced by this.The religious influence even expands widely into the arts, which makes Bali distinct from the rest of Indonesia. In spite of the fact that tourists flood to the island every year, Balinese people have managed to conserve their culture. Almost every native of Bali is an artist in some form or another. Parents and villagers have passed on their skills to their children, who all seem to have preference either for music, dance, or painting. Another remarkable mark of the Balinese culture is the series of ceremonies and rituals known as the Manusa Yadnya. This marks the different stages of Balinese life. Cremation is very popular on this island--and unlike in the West, death is a joyous and color1ful event for the Balinese. Which of the following is true about Balinese people? A) They are good at controlling themselves at the funeral. B) They are all good artists in one or another. C) They have their own way to preserve their culture. D) They can only pass on their skills by word of mouth.
(Answer)
C
Ques: Folk medicine keeps the body healthy by using medicines taken from surrounding plants and herbs . Since materialsfor making a medicine to cure a sickness can be found everywhere, one can practise folk medicine in any place of the world. The use of folk medicine goes all the way back to the time of the earliest man when both man and animal used plants and herbs to keep healthy. It is usually seen that an animal eat snakeroot after being bitten by a poisonous snake. Because animals seem to have this natural ability for knowing which plants and herbs will cure what sickness, man probably learned how to care for himself by animal watching. Man also learned other things from animals. He observed that wild animals, when sick, kept quiet and rest, getting well with the help of the medicine in plants and pure air. He saw that an animal with a fever could often be found resting in a cool place, eating nothing, and often drinking water until the fever was gone. Some believe that folk medicine deals with a lot of old wives' tales which have something to do with the medical treatment of the body. Stories are told about the powers of a certain vegetable material, which when hung around the neck, brings the wearer good health during the cold winter months. Such a story is simply a fairy tale. It should be separated from the discussion of folk medicine. This passage is mainly about _ . A) animals' natural power to cure diseases B) how the earliest man kept healthy C) a discussion of folk medicine D) what man has learned from animals
Ans: C
Question: The Maryland Science Center is more than fun. You can enjoy the First three floors of exciting things, watch the larger-than-life play on the 4th floor, and travel to other worlds, to far away stars, on the 5th floor. Don't just look. You arc expected to feel, to turn, to push. Build your own house and learn why it stands or fails. Use computers to work out plans just as famous scientiats have done. There is always something new to Learn at the Maryland Science Center. Children and group visitors enjoy half price. The excitement of the Maryland Science Center does not end when you leave. Visit the Science Store for gift you'd like to keep. Electronic jewelry, games, books, and more - take part of the Science Center home with you. Important information : Where to call 24 hour general information (410)685 -5225 24 hour STARLINE night sky information (410)539 STAR Group visitor information (410 ) 685 - 2370 Hours The Maryland Science Center open 7 days a week (except Thanksgiving Day and Christmas Day). Monday - Friday 10 a.m. - 6 p. m. Saturday and Sunday 10 a. m. -8 p. ra. Which is true about the Maryland Science Center? A) Visitors can play and learn at the same time. B) It has three floors altogether. C) It helps visitors travel to other countries. D) "The price is the same for children and adults.
Answer:
A