题目

淀粉→麦芽糖→葡萄糖→糖原，表示某生物体内糖类的转化过程，下列说法中正确的是（）       A．  此生物一定是动物，因为能将淀粉转化为糖原       B．  上述关于糖的转化不可能发生在同一生物体内       C．  此生物一定是植物，因为它能利用淀粉和麦芽糖       D．  淀粉和糖原都是动物细胞储存能量的多糖Public transportation is a great method of decreasing(减少)pollution and traffic within an urban setting. However, as with any public setting, it is important to take safety measures to avoid any unpleasant situations.Tips for staying safe on the bus, train or subway:Report any unusual activities.Report any broken or missing equipment.Report any strange noises or smells.If you see an unattended(无人看管的)package, do not touch it, and immediately report it to the nearest employee.Avoid touching your eyes, nose or mouth. This will decrease your chance of getting sick or spreading germs(细菌).While on public transportation the most important safety measure to take is simply paying attention to your surroundings. By taking these steps you can have a better and more enjoyable experience while using the public bus, train or subway.Safety measures and regulations(规章制度)Sometimes stories of tragic public transportation are released(发布) through the media（媒体）. When this happens it is natural to question the safety of using public transportation. When the driving itself is out of your control, it is important to know what measures and regulations are put into place to keep you safe.One of the greatest concerns for public transportation safety is the lack of safety belts. While accidents involving buses or trains is not common, when they do occur they are highly dangerous due to the lack of safety belts. Passengers are likely to be injured simply from being hit by another passenger.Good drivers make safe passengers With hundreds of thousands of public bus passengers every day, it is important that the drivers of these vehicles(车辆)are trained and experienced enough to manage the dangerous situations that can happen on the road. Bus and train drivers must meet the standards set by their state.1. One advantage of public transportation is that __________________________. A. it’s cheaper                                   B. it saves more time C. it has more safety measures      D. it helps protect the environment2. To keep safe on public transportation, you are advised to _____________. A. repair any broken equipment if necessary B. cover your nose with your hand to keep germs away C. pay attention to any unusual activities and report them in time D. take the package which nobody takes care of to the employee3. We can know from the passage that ___________________________. A. few reports are about public transportation accidents B. passengers seldom get hurt in public transportation accidents C. safety belts are useless for passengers on public transportation D. it is important to know some safety measures for public transportation4. What is important to make a good public transportation drivers? A. Skills at handling traffic accidents B. Higher standards and shorter working hours. C. Polite service and clean working environment. D. Proper training and rich driving experience.