Q: Suppose you are reading a book. Suppose, too, you suddenly close your eyes. Can you still see the book? "Of course not," you will say. But can you tell why? You would probably say, "When I close my eyes my eyesight cannot get out of my eyes to get to the book. " But this explanation is wrong.      You cannot see any object unless light from that object gets into your eyes. Some of the things you see give off light of their own. The sun, the stars, a lighted lamp are examples of that can be seen by their own light. Such things are luminous. Most of the things you see are not giving off light of their own. They are simply reflecting   light that falls on them from the sun or some other luminous body. The moon, for example, does not give off any light of its own. It is non-luminous. You see it because sunlight falls on it and some of it reflects in your direction. So moonlight is only second-hand sunlight.     When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.      Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380,000 kilometres away, in only a little more than a second. _   have light of their own. A) The sun and the moon B) The stars and the earth C) The sun and the stars D) The moon and the earth
A: C


Q: Up to 90% of school leavers in major Asian cities are suffering from myopia ---short-sightedness, a study suggests. Researchers say the "extraordinary rise" in the problem is being caused by students working very hard in school and missing out on outdoor light. Eye experts say that you are short-sighted if your vision is blurred  beyond 2m. It is often caused by an elongation  of the eyeball that happens when people are young. According to the research, the problem is being caused by a combination of factors - a commitment to education and lack of outdoor light. Professor Morgan who led this study argues that many children in South East Asia spend long hours studying at school and doing their homework. This in itself puts pressure on the eyes, but exposure to between two and three hours of daylight helps maintain healthy eyes. Cultural factors also seem to play a part. Across many parts of South East Asia, children often have a lunchtime nap. According to Professor Morgan they are missing out on natural light to prevent short-sightedness. A big concern is the numbers of the students suffering from "high" myopia. One in five of these students could experience severe visual impairment  and even blindness. These people are at considerable risk--sometimes people are not told about it and are just given more powerful glasses--they need to be warned about the risk and given some self-testing measures so they can get to an ophthalmologist and get some help. For decades, researchers believed there was a strong genetic component to the condition. But this study strongly suggests an alternative view. "Any type of simple genetic explanation just doesn't fit with that speed of change; gene pools just don't change in two generations. Whether it's a purely environmental effect or an environmental effect playing a sensitive genome, it really doesn't matter, the thing that's changed is not the gene pool---it's the environment." What's the best way to take care of your eyes according to the passage? A) Equip the classroom with better lights. B) Look at the sun from time to time. C) Do eyes exercise regularly. D) Spend more time in the open air.
A: D


Q: As an effect of the high fuel prices spent on bus transportation, some American schools are changing to a four-day week. That means longer days instead of the traditional Monday through Friday schedule. Having been approved for three years and beginning in the fall, students in the Maccray school district in Minnesota will be in school from Tuesday to Friday. Each school day will be 65 minutes longer. Officials say the district expects to save about sixty-five thousand dollars a year in transportation costs. In new Mexico, the first school district changed to a four-day week in 1974 because of the Arab oil boycott . Now, 17 out of 89 districts use it. In Custer, South Dakota, students have been going to school four days a week since 1995. Superintendent Tim Creal says the change has saved about one million dollars over just the past eight years. He sees other benefits, too. Students get more instructional time, and activities that used to take up class time are now held on non-school days. He says that in the future, the growth of online classes could make it possible to require even fewer days in school. High fuel prices are driving college students to take more online classes. A four-day school week sounds like a great idea for students and teachers, but working parents may have to pay for child care for that fifth day. The passage is mainly about  _ A) some school's four-day week plan B) districts using a four-day week. C) how to save on transportation fees. D) expense of school transportation.
A: A


Q: The amazing image shows the world's largest ever cruise ship, complete with beach pool, shopping mall, rock-climbing walls, outdoor amphitheater and New York-style loft suites .The "traveling city" is being built on dry-docks in Finland by Royal Caribbean International, and she is named Oasis of the Seas. Almost 1,200 feet long, 154 feet wide and rising 213 feet above the water line, the Oasis of the Seas will be able to host 3,000 crew to service every passenger's need.In addition to the size, the Oasis of the Seas will also be the first ship that attracts people by the cruise line's new neighborhood concept: 7 distinct themed areas, including Central Park, Boardwalk, the Royal Promenade, the Pool and Sports Zone, Vitality at Sea Spa and Fitness Center, Entertainment Place and Youth Zone.Of all these areas, the excellent zone will be "Central Park". Protected from the weather by a clear screen to let in the light, the Central Park area will be themed on Caribbean plants and leaves reflecting the area which the ship will eventually cruise in.And the park zone will have different restaurants, bars and boutique shops, bringing the idea of "floating city" to reality. In addition, Oasis of the Seas will also include a rock wall, over 15 restaurants and bars, a casino , a theatre, two night-clubs and the largest freshwater pool on any cruise liner. "Royal Caribbean is proud to introduce a number of 'firsts' that the world has never seen before," said Adam Goldstein, "Oasis of the Seas is the ultimate expression of the creativity and imagination found on all of our ships, providing guests with a collection of experiences that will offer an incredible cruise vacation." The Oasis of the Seas includes a number of 'firsts' EXCEPT   _  . A) the world's largest ever cruise ship B) its way of attracting tourists C) the largest freshwater pool on any cruise liner D) its most delicious food in the world

A: D