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FDA based its order upon a wide investigation of sleep-driving.
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根据材料回答{TSE}题： Going on a Diet A typical person needs about l，800 calories per day
There is always excitement at the Olympic Games when an athlete breaks a previous record
根据材料回答{TSE}题： Forests for Cities You are standing in a beautiful forest in Japan。The air is clean and smells like plants and flowers． There are l75 different kinds of trees，and 60 kinds of birds live here．___________(46)You are downtown in the city of Nara，Japan，in Kasugayama Forest，the oldest urban forest in the world．It was started more than a thousand years ago，and today it’s very popular with tourists．and artists． Cities around the world are working to protect their urban forests．Some urban forests are parks， and some are iust streets with a lot of trees．But all urban forests have many good effects oil the environment．___________ (47)They also stop the noise from heavy traffic．They even make the weather better because they make the air 3—5 degrees cooler，and they stop strong winds． Urban forests also have many good effects on people．They make the city more beautiful．In a crowded area，they give people a place to relax and spend time in nature．___________ (48) In some countries，people are starting new urban forests．In England，there are now l．3 million trees in an urban forest called Thames Chase，east of London．It was started in l 990，and it has grown very fast．Walking and bicycle clubs use the forest，and there are programs for children and artists．___________ (49) Some older cities don’t have space for fl big urban forest，but planting trees on the streets makes the city better．Scientists found that commuters(通勤人员)feel more relaxed when they can see trees． Trees are even good for business．___________ (50)In the future，urban forests will become even more important as our cities grow bigger．In the megacities(超大城市)of tomorrow，people will need more green space to live a comfortable life．Planting trees today will make our lives better in the future． A. People spend more time at shopping centers that have trees. B. In hot countries, urban forests are cool places for walking.and other healthy exercises. C. But you are not in rural area. D. Trees take pollution out of the air. E. In 2033, it will have 5 million trees. F. It has many kinds of birds in the country. {TS}__________
根据材料回答{TSE}题： 第一篇 Genetic Engineering Genetic ehgineering began when the DNA molecule(分子)，the most basic unit of life，was first described in l953 by James Watson and Francis Crick．An understanding of DNA led to the altering of normal cell reproduction．Experiments with altering human cells began in l970．In one of the first experiments，patients were injected with a virus that would produce a life—saving enzyme，but their bodies would not accept it．In l980 patients with a rare but fatal blood disease were injected with a purifled gene that was cloned through DNA technology．Another failure． Genetic engineering got a legal boost(激励)in l980．The U．S．Supreme Court said that a patent could be granted on a genetically engineered“oil—eating”bacterium(细菌)．This bacterium would help clean up oil spills．The ruling encouraged companies to invent new life forms，and three important medical products were quickly developed． Human interferon(干扰素)一a possible solution to some cancers and viral disease．A newly engineered bacterium produced human interferon as a by—product．This new product reduced the cost of interferon． Human growth hormone—for children whose bodies do not grow to normal height．An expensive growth hormone(荷尔蒙)was previously produced from human cadavers，but by changing the genetic make—up of the single—cell bacterium E．coli，and affordable growth hormone could be produced． Human insulin(胰岛素)一for the treatment of diabetes．People with diabetes used to rely on a beef-or pork—based product until l982．Now insulin can be manufactured by genetically altered bacteria． Advances in genetic engineering have continued，though they constantly must be weighted against the safety of procedures．There is clearly much more to discover． {TS}This passage is mainly about________．
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