患者，12岁，全口牙齿均呈均匀灰色，个别牙齿表面釉质缺损。临床诊断可能是（）_口腔内科专业知识_全学科试题题库

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患者，12岁，全口牙齿均呈均匀灰色，个别牙齿表面釉质缺损。临床诊断可能是（）
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Many people prefer text messages(短信)to actually talking. Almost overnight, text messages have become the preferred form. of communication for millions. But even as industry calculations show that Americans are now using mobile phones to send or receive more text messages than phone calls. Those messages are under great pressure because of the danger they can pose by distracting users. Though there are no official casualty(伤亡)statistics, there is much evidence that the number of fatal accidents resulting from texting while driving, crossing the street or engaging in other activities is on the rise. "The act of texting automatically removes 10 I. Q. points," said Paul Saffo, a technology trend forecaster in Silicon Valley. "The truth of the matter is that there are hobbies that are incompatible(不相容的). You dont want to do mushroom-hunting and bird-watching at the same time, and it is the same with texting and other activities. We have all seen people walk into parking meters or walk into traffic and seem startled by oncoming cars. " In the latest fight against text messaging, the California Public Utilities Commission announced an emergency measure on Thursday temporarily banning the use of all mobile devices by anyone at the controls of a moving train. The ban was adopted after federal investigators announced that they were looking at the role that a train engineers text messaging might have played here last week in the countrys most deadly rail accident in four decades. A California lawmaker is also seeking to ban text-messaging by drivers, a step already taken by a handful of other states. "We have had far too many tragic incidents around the country that are painful proof that this is a terrible problem. " said Joe Simitian, who wrote the California law requiring drivers who are talking on a cell phone to use hands-free devices.What can we know from the second paragraph?A．Text messaging may result in many accidents.B．Text messaging has caused most of the accidents recently.C．Many people are going to text messages instead of telephoning.D．The government is now trying to stop text messaging.

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