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单项选择题False Fear of Big FishMany people believe sharks (鲨鱼) are dangerous and will always try to hurt or even kill humans.____________(46).A shark exhibition at the National Aquarium (水族馆) in Baltimore, US, proves this.Visitors can touch young sharks, see their eggs develop and watch a dozen different species swim smoothly around a huge tank.Most people fail to realize that shark attacks don't happen very often. Humans aremore likely to be killed by lightning than by a shark.____________(47) There, kids can learn; from an early age, not to fear sharks.'People fear what they don't know,' said Nancy Hotchkiss, an organizer of the exhibition. 'Sharks have been around for 400 million years and play an important role in the ocean's food chain. We want people to discover that sharks are amazing animals that need our respect and protection.'____________(48) A study, published in January in the US magazine, Science, found that almost all recorded shark species have fallen by half in the past eight to 15 years.Thousands of sharks are hunted in Asia for special foods, such as shark fin (鱼翅)soup. And many others get caught in nets, while fishermen are hunting other fish.____________(49)'Some fishing methods are actually cleaning out the ocean for sharks,' said Dave Schofield, the manager of the aquarium's ocean health programmE.____________(50)A.They can watch them develop inside their eggs and feel the skin of the older swimmers.B.A shocking 100 million sharks are killed every year around the world by humans.C.In fact, 94 per cent of the world's 400 species are harmless to humans.D.It is a worrying situation and some areas have put measures in place to, protect these special fish.E.And to make this point clear, the museum has set up a special touching pool for children.F.More than half of the sharks caught are smaller than 1 metre long.第 46 题 请选择（46）处的最佳答案．

单项选择题The Smog(烟雾)For over a month, Indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought for 50 years. Smoke from the fires mixed with sunlight and hot dry air to form. a cloud of smog. This pollution quickly spread and within days it was hanging over neighbouring countries including Malaysia, Singapore and ThailanD.When the smoke combined with pollution from factories and cars, it soon became poisonous (有毒的). Dangerous amounts of CO became trapped under the smog and pollution levels rosE.People wheezed (喘息) and coughed as they left the house and their eyes watered immediately.The smog made it impossible to see across streets and whole cities disappeared as grey soot (烟灰) covered everything. In some areas, water was hosed (用胶管浇) from high-rise city buildings to try and break up the smog.Finally, heavy rains, which came in November, put out the fires and cleared the air. But the environmental costs and health problems will remain. Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes (汽车站排放的废气) and factory pollution. Breathing problems could well increase and many non-sufferers may have difficulties for the first timE.Wildlife has suffered too. In lowland forests, elephants, deer, and tigers have been driven out of their homes by smog.But smog is not just an Asian problem. In fact, the word was first used in London in 1905 to describe the mixture of smoke and thick fog. Fog often hung over the capital. Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents. About 4,000 Londoners died within five days, as a result of thick smog in 1952.第 16 题 Indonesia was in crisis because of the drought.A.RightB.WrongC.Not mentioned