The National Dark-Sky Week (NDSW) is a week during which people all over the United States turn off their lights to enjoy the beauty of the night sky without light pollution. This even was started by Jennifer Barlow of Midlothian, Virginia in 2003, and it is becoming more popular each year. It has been supported by the International Dark-Sky Association, the American Astronomical Society, and the Astronomical League. This even always occurs in April, during the week of the new moon so that the sky can be as dark as possible for the best viewing conditions. "It is my wish that people could see the night sky without other light in the sky as our ancestors   saw it hundreds of years ago," explains Barlow.  _ The main goal of NDSW is to increase awareness   of the harmful effects of light pollution. It is not possible for all of the light pollution in this part of the world to disappear. However, it is possible to make a small difference in the quality of the night sky. Another goal of this even is to promote   the use of better lighting systems that direct light toward the ground instead of up into the sky. Jennifer Barlow states, "The night sky is a gift of such beauty that it should not be polluted by wasted light. In this way, our children will not lose touch with the wonder of our universe." What is the main goal of the National Dark-Sky Week? A) To promote the use of better lighting systems. B) To help people realize the harm of light pollution. C) To cause all the light pollution in America to disappear. D) To help young children enjoy the wonder of our universe.
D

As a teenager in 1972, Bill Gates boasted that he would be a millionaire by the time he was 20. While he did not quite achieve that goal, only 15 years later, he was a millionaire. And by 1992, as head of the Microsoft company, he became the richest man in America with assets of nearly US $ 6.3 billion. Born in Seattle, Washington on 28, October, 1956, Gates was named William Henry after his father and grandfather. From the beginning, he was an extremely energetic and intelligent child. He had read the entire world book encyclopedia by the age of nine. His favorite subjects at school were science and math and his favorite pastime was "thinking". Gates first started to play with computers at the age of 13. Before long he became an expert at working the school's computer. After his graduation from secondary school, Gates was accepted by the three top universities in the USA-Princeton, Harvard and Yale. He chose Harvard and began classes there the next autunm, majoring maths. But he was still obsessed with computers and spent as much time in the computer laboratories as he did in the lecture halls. By 1975, Gates and a partner, Paul Allen, had developed a software program called BASIC. This was not the first program ever created, but its inventors were the first to decide that people who wanted to use it should pay for it. BASIC was a success because until it came along, there had been no efficient way of getting computers to carry out instructions. Although he had not completed his degree, Gates left university and went to work full time for the new company he had formed called Microsoft. His next project was the software program that made him famous and very rich. It was called DOS, short for Disk Operating System, and it was purchased by IBM in 1980. Today it is the operating system used in more than 14 million personal computers around the world. As chief executive officer of Microsoft, Gates is known as a bright man, but one who is not easily satisfied. He is quick to criticize his staff and hates to be... When he was a teenager, Bill Gates wanted to be a   _  . A) teacher B) doctor C) businessman D) professor
C

The island of Great Britain being small (compare the size of Australia), the natural place for holiday relaxation and enjoyment is extensive coastline, above all its southern and eastern coasts, and the favorite resort of the mass-population of industrial Lancashire, is on the north-west coast. Distant and little-inhabited area like Northern Scotland, are too remote for the development of large seaside resorts. For most children, going to the seaside suggests a week or fortnight of freedom on the beach, ideally a sandy one providing enough opportunities for the construction of sandcastle, fishing in pool, paddling in shallow water or swimming in deep water. Their parents spend sunny days swimming in the sea and sunbathing on the beach. Not that the British sun can be relied on and the depressing sight of families wandering round the town in old -fashioned and under umbrellas is only too common. However, there are always shops with their tourist souvenirs, plenty of cafes and if the worst comes to the worst, the cinema to offer a refuge. The average family is unlikely to seek accommodation in a hotel as they can stay more cheaply in a boarding-house. There are usually three or four-storeyed Victorian buildings, whose owners spend the summer season letting rooms to a number of couples or families and providing three cooked meals a day at what they describe as a reasonable price, with the hope that in this way they will add enough to their savings to see the winter through. Otherwise there are the camping sites for those who prefer self-catering. Nowadays, even when an increasing number of people fly off to Mediterranean resorts where a well-developed suntan   can be assured, or explore in comfort Swiss lakes and mountains or romantic Italian or Spanish cities, the British seaside is still the main attraction for families, especially those with younger children. As they queue for boats trips, cups of tea or ice-cream under gray skies and in dizzling rain, the parents are reliving   their own childhood when time... Many parents once played on the British beach and   _  . A) still have their happy memories of it B) don't want to have a holiday there C) don't want to take their children to have a holiday there. D) want to build their own sandcastles the most splendid on the beach again

A