Question: Read the article and select the best answer. Article: Hong Kong is one of the most densely populated cities in the world, but with night skies around 1,000 times brighter than globally accepted levels, it gains a bad reputation for its light pollution. A study by Hong Kong University found that brightness levels in the southern Chinese city's popular shopping district of Tsim Sha Tsui were 1,200 times greater than the international dark sky standard. The crowded city of 7 million residents , full or residential high-rises, towering office blocks and neon advertisements, has no laws to control outdoor lightning. The result is that light pollution is thought to be much worse than in other large cities, including London, Sydney, Tokyo and Shanghai. "In Hong Kong , you can't go anywhere outdoor in the evening without your eyes being blinded by this really disturbing outdoor lightning," the light pollution survey's head Jason Pum told AFP. "The fact that we have all this light in the sky means energy is wasted," he said, adding that too much artificial lightning also affects nightly wildlife. Research has suggested that light pollution can cause a number of harmful health effects in humans, including sleeplessness and headaches and can also interrupt body clocks and hormones . The university survey, the result of five million measurements taken from points across the city, was released just days before the start of the annual Earth Hour event, organized by the World Wildlife Fund. People around the world will be encouraged to turn off the lights for an hour on Saturday night to raise awareness of climate change. Last year, a number of Hong Kong's major buildings along Victoria Harbour went dark to mark Earth Hour. "Anyway, we should do our best to reduce the amount of lightning and adjust it for the benefit of the environment." Question: .We can know from the passage that _ Options: A: light pollution in Hong Kong is among world's worst. B: light pollution is the biggest problem in Hong Kong. C: Earth Hour is simply organized to reduce pollution. D: light pollution is the primary causes of sleeplessness.
Answer: A

Question: Read the article and select the best answer. Article: Spending just a few hours a week online may make people feel more socially isolated , lonely and downhearted , according to a two-year study of nearly 100 families with the Internet. "We were surprised to find that social technology has such bad effects on social communications," the lead author, Dr. Robert Kraut of Carnegie Mellon University in Pittsburgh, Pennsylvania, said in a statement to the news. The findings suggest that "Rather than encourage students to use the Internet alone for research, teachers might give pupils online group homework to complete with classmates. Local groups might build websites that allow neighbors to discuss local affairs ." "Before the technology develops and can be really more _ , people shouldcontrol their wishes to use much of the Internet," Dr. Kraut and other experts advise. In order to control their children and encourage family activities, parents might think of putting the computer in the living room rather than in a child's room, they suggest. Dr. Kraut also suggests that when surfing on the net, especially when chatting with strangers on the net, children should not use their real names, and that they should not tell the addresses, telephone numbers to the strangers. Question: This study was made by . Options: A: 100 families B: Dr. Kraut and other experts C: the newspaper D: Dr. Kraut only
Answer: B

Question: Read the article and select the best answer. Article: British Summer Time runs from the last Sunday in March to the last Sunday in October. In the depths of winter the nights in the UK are anything from 15-19 hours long. Longer nights mean frost and fog are more likely to form. Twice a year the clocks change, forward in the spring and then back again in the autumn. But why? It happens twice a year. We all change our clocks and watches by one hour. In the spring, we add an hour, and go onto what is called British Summer Time, while in the autumn, we do the reverse, and return to Greenwich Mean Time. Why bother? It's all to do with saving the hours of daylight, and was started by a guy called William Willett, a London builder, who lived in Petts Wood in Kent. Basically, he figured that you could improve the population's health and happiness by putting forward the clocks by twenty minutes every Sunday in April and do the opposite in September. Economics His idea was not taken up, even though a "Daylight Saving Bill" was introduced some five years before the outbreak of World War One. But once the war started, it was considered wise to economics, to promote greater efficiency in using daylight hours, and in the use of artificial lighting. And so in 1916, "Daylight Saving Time" was introduced. Even though most countries abandoned this after that war, some eventually decided that it was a good idea, and most of these nations began to keep it throughout the year. Experiment Since 1972, Britain has decided to go with Greenwich Mean Time in winter, and British Summer Time in Summer. But back in 1968, Britain tried a four-year experiment by advancing time one hour ahead of GMT throughout the year. But those living further north, particularly in Scotland, found it most unsatisfactory, with dark mornings for much of the year, and the experiment was dropped. Question: Why some countries decide to change the clocks after World War One? Options: A: To improve the people's health and happiness. B: To do a certain experiment C: To save energy to develop economies. D: All of the above.
Answer:
C