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Read the following article and select the best answer. Article: Every year thousands of tourists visit Pompeii, Italy. They see the sight that Pompeii is famous for--its stadium and theaters, its shops and restaurants. The tourists do not, however, see Pompeii's people. No one has lived in Pompeii for almost 2,ooo years. Once Pompeii was a busy city of 22,000 people. It lay at the foot of Mt Vesuvius, a grass-covered volcano. Mt Vesuvius had not erupted for centuries, so the people of Pompeii felt safe. But they were not. In August of the year 79 AD, Mt Vesuvius erupted. The entire top of the mountain exploded, and a huge black cloud rose into the air. Soon stones and hot ashes began to fall on Pompeii. When the eruption ended two days later, Pompeii was buried under 20 feet of stones and ashes. Almost all of its people were dead. For centuries, Pompeii lay buried under stones and ashes. Then in the year 1861, an Italian scientist named Ginseppe began to uncover Pompeii. Slowly, carefully, Ginseppe and his men dug. The city almost looked the same as it had looked in 79 AD. There were streets and fountains, houses and shops. There was a stadium with 20,000 seats. Perhaps the most important of all, there were everyday objects, which tell us a great deal about the people who lived in Pompeii. Many glasses and jars had some dark blue color in the bottom, so we know that the people of Pompeii liked wine. They liked bread too; metal bread pans were in every bakery. In one bakery there were 81 round, flat loaves of bread--a type of bread that is still sold in Italy today. Tiny boxes filled with a dark, shiny powder tell us that women liked to wear eye-makeup. Ginseppe has died, but his work continues. One-fourth has not been uncovered yet. Scientists are still digging, still making discoveries that draw the tourists to Pompeii. Question: Why did the city uncovered look almost the same as it had looked in 79 AD ? - Because Ginseppe and his men dug it slowly and carefully. - Because the city was buried alive and remained untouched. - Because scientists successfully rebuilt the city with everyday objects. - Because nobody had lived in the city ever since the volcano erupted.
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Because Ginseppe and his men dug it slowly and carefully.

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Read the following article and select the best answer. Article: Nuclear power's danger to health, safety, and even life itself can be described in one word; radiation . Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. At very high levels, radiation can kill an animal or human being completely by killing masses of cells in important organs . But even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be significant. This is the case when only a few cells are hit, and if they are killed completely. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in an unusual way. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the knowledge of the person at the time that damage has occurred. A person can be irradiated and feel fine, then die of cancer five, ten, or twenty years later as a result. Or a child can be born weak or easy to get serious illness as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth. Question: According to the passage, the danger of nuclear power lies in _ . - nuclear mystery - radiation detection - radiation level - nuclear radiation
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nuclear radiation

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Read the following article and select the best answer. Article: The German shepherd runs off and noses around in the grass of Kenya's Laikipia Plateau. "OK, Oakley," the dog's handler orders, "Find it!" Oakley sniffs until he comes to a bush, then stops, sits, and looks up at his handler. She bends to see what he has found: the waste of an endangered African wild dog. "Good dog!" she praises. The handler pulls a tennis ball from her pocket. Oakley jumps for his reward. "He doesn't actually want the waste," says Aimee Hurt, a founding member of the U.S.-based group Working Dogs for Conservation. Hurt is in Kenya to train both Oakley and his handler. "He finds it so he can play with his ball. We're the ones who want the waste." Detection dogs are sometimes taught to locate actual animals. Black-footed ferrets have been studied with their help. But more often the dogs learn to locate the waste of creatures such as bears, wolves and mountain lions. What the dogs find provides scientists with data about a species. Scientists can use the DNA collected from animal waste to identify individuals, sex, and population sizes -- all without ever seeing the animal itself. "It can take years to gather this kind of information if you have to trap animals," Hurt explains. Waste analysis might make a huge difference when wild species are accused of attacking domestic livestock . Hurt says, "A good detection dog will find the waste so we can see what the animal is actually eating." This may help reduce problems between people and wildlife. Question: What is the main idea of the passage? - Detection dogs can help scientists study wildlife. - Detection dogs can defend wildlife. - Detection dogs can help the police catch the criminals. - Detection dogs can help local people defend domestic livestock.
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Detection dogs can help scientists study wildlife.