属于替牙期间暂时性错的是（）

A:恒前牙反 B:恒前牙盟出时，出现中度拥挤 C:前牙开1mm D:上下恒切牙盟出早期，出现前牙深覆 E:上下颌第1恒磨牙建初期，完全远中关系

患者男性35岁，冠根斜折，做过根管治疗。在分根拔除过程中，腭根突然消失，探牙槽窝空虚，无阻力，捏鼻鼓气时牙槽窝内有气泡产生，此时首先应做的是（）

A:扩大牙槽窝掏根 B:拍X线片 C:上颌窦开窗取根 D:碘仿海绵填塞牙槽窝暂观察 E:采用邻近粘膜瓣关闭拔牙窝

Text 2
A teenager was unable to call an ambulance after her parents were shot in February because the family’ s internet phone service did not offer access to the 911 emergency number. A baby died in March for the same reason. Sad tales such as these led America’ s Federal Communications Commission (FCC) to vote on May 19th to require internet phone companies to offer a 911 service.
In so doing, the FCC seemed to have taken its first, big step towards imposing traditional telecoms rules on the internet--a contentious move given the fears that this will strangle what many still regard as an infant industry, especially if regulators elsewhere follow suit. But are the new rules really so bad
The new rules uphold a subset of telecoms policy, social objectives, which is much less burdensome than the FCC’S hugely unpopular economic regulation. Many providers of internet telephony--strictly, Voice over Internet Protocol (VOIP)--have for years sought the technical ability to provide an emergency service, knowing that such a feature would be essential were internet telephony ever to become a truly credible alternative to the traditional phone service. Incumbent operators that manage the emergency-service sys tem have not always made it easy for the upstarts to interconnect, which costs a provider almost $ 10m a year for nationwide service. The FCC has signaled that incumbent operators had better now act fairly.
Moreover, the new rules apply only to certain firms, are easy to implement, and pro vide flexibility for future technical improvements. Only firms that offer VOIP via the public telephone network will have to provide 911, and to use it their customers will have to register their addresses. Only when internet technology is developed to allow the network to tell where a phone is connected to it will other VOIP operators be required to introduce this facility. Significantly, services based mainly on software, such as voice-enabled instant-messenger programs or online video games, which do not try to resemble regular phone service, are exempt.
All in all then, the new policy is unlikely to do much to slow a business now growing rapidly worldwide. In America, VOIP is on track to exceed $ 1 billion in revenue this year, with over 3m users. Many ordinary phone firms now use the technology to connect calls, helping VOIP to account for a growing slice of international phone traffic.
Having found an elegant way to impose 911 rules on VOIP, the FCC’s next challenge will be to secure wire-tapping capability for law-enforcement surveillance. This is an issue that similarly has been quietly debated for years. It may take another set of tragedies before it is mandated in a quick, unanimous vote by the regulators.

We can learn from the text that FCC's mandate（）

A:resulted from emergent tales. B:offered free 911 service. C:originated from tragic accidents. D:strangled new rules.

Text 2
A teenager was unable to call an ambulance after her parents were shot in February because the family’ s internet phone service did not offer access to the 911 emergency number. A baby died in March for the same reason. Sad tales such as these led America’ s Federal Communications Commission (FCC) to vote on May 19th to require internet phone companies to offer a 911 service.
In so doing, the FCC seemed to have taken its first, big step towards imposing traditional telecoms rules on the internet--a contentious move given the fears that this will strangle what many still regard as an infant industry, especially if regulators elsewhere follow suit. But are the new rules really so bad
The new rules uphold a subset of telecoms policy, social objectives, which is much less burdensome than the FCC’S hugely unpopular economic regulation. Many providers of internet telephony--strictly, Voice over Internet Protocol (VOIP)--have for years sought the technical ability to provide an emergency service, knowing that such a feature would be essential were internet telephony ever to become a truly credible alternative to the traditional phone service. Incumbent operators that manage the emergency-service sys tem have not always made it easy for the upstarts to interconnect, which costs a provider almost $ 10m a year for nationwide service. The FCC has signaled that incumbent operators had better now act fairly.
Moreover, the new rules apply only to certain firms, are easy to implement, and pro vide flexibility for future technical improvements. Only firms that offer VOIP via the public telephone network will have to provide 911, and to use it their customers will have to register their addresses. Only when internet technology is developed to allow the network to tell where a phone is connected to it will other VOIP operators be required to introduce this facility. Significantly, services based mainly on software, such as voice-enabled instant-messenger programs or online video games, which do not try to resemble regular phone service, are exempt.
All in all then, the new policy is unlikely to do much to slow a business now growing rapidly worldwide. In America, VOIP is on track to exceed $ 1 billion in revenue this year, with over 3m users. Many ordinary phone firms now use the technology to connect calls, helping VOIP to account for a growing slice of international phone traffic.
Having found an elegant way to impose 911 rules on VOIP, the FCC’s next challenge will be to secure wire-tapping capability for law-enforcement surveillance. This is an issue that similarly has been quietly debated for years. It may take another set of tragedies before it is mandated in a quick, unanimous vote by the regulators.

It is implied in the third paragraph that（）

A:lack of a 911 service will dim the prospect of internet telephony to some extent. B:popular economic regulators are supportive of telecoms. C:the technical ability is essential to many providers. D:incumbent operators manage phone service fairly for the time being.

对给定的关键字序列110，119，007，911，114，120，122进行基数排序，则第2趟分配收集后得到的关键字序列是

A:007，110，119，114，911，120，122 B:007，110，119，114，911，122，120 C:007，110，911，114，119，120，122 D:110，120，911，122，114，007，119

Speaker A: 911 Emergency.Speaker B:______

A:We need your help. Someone has broken into our house. B:All fight. Hurry up, I' m in hospital. C:How much is the phone call D:May I speak to Dr. Wang, please

Cell phones are a danger on the road in more ways than one. Two new studies show that talking on the phone while traveling, whether you’re driving or on foot is increasing both pedestrian deaths and those of drivers and passengers, and recommend crackdowns on cell use by both pedestrians and drivers.
The new studies, lead-authored by Rutgers University, Newark, Economics Professor Peter D Loeb, relate the impact of cell phones on accident fatalities to the number of cell phones in use, showing that the current increase in deaths resulting from cell phone use follows a period when cell phones actually helped to reduce pedestrian and traffic fatalities. However, this reduction in fatalities disappeared once the numbers of phones in use reached a "critical mass" of 100 million, the study found.
These studies looked at cell phone use and motor vehicle accidents from 1975 through 2002, and factored in a number of variables, including vehicle speed, alcohol consumption, seat belt use, and miles driven. The studies found the cell phone-fatality correlation to be true even when including factors such as speed, alcohol consumption, and seat belt use.
Loeb and his co-author determined that, at the current time, cell phone use has a "significant adverse effect on pedestrian safety" and that "cell phones and their usage above a critical thresholds adds to motor vehicle fatalities." In the late 1980s and part of the 1990s, before the numbers of phones exploded, cell phone use actually had a "life-saving effect" in pedestrian and traffic accidents, Loeb notes. "Cell-phone users’ were able to quickly call for medical assistance when involved in an accident. This quick medical response actually reduced the number of traffic deaths for a time," Loeb hypothesizes.
However, this was not the case when cells were first used in the mid-1980s, when they caused a "life-taking effect" among pedestrians, drivers and passengers in vehicles. In those early days, when there were fewer than a million phones, fatalities increased, says Loeb, because drivers and pedestrians probably were still adjusting to the novelty of using them, and there weren’t enough cell phones in use to make a difference in summoning help following an accident, he explains.
The "life-saving effect" occurred as the volume of phones grew into the early 1990s, and increasing numbers of cells were used to call 911 following accidents, leading to a drop in fatalities, explains Loeb. But this life-saving effect was canceled out once the numbers of phones reached a "critical mass" of about 100 million and the "life-taking effect" increased accidents and fatalities outweighed the benefits of quick access to 911 services, according to Loeb.
Loeb and his co-authors used econometric models to analyze data from a number of government and private studies. He and his co-authors recommend that governments consider more aggressive policies to reduce cell phone use by both drivers and pedestrians, to reduce the number of fatalities.
Which of the following statements DOES NOT answer the question "What caused the ’life-saving effect’ to occur in the early 1990s"

A:There were more cell phone users during that period. B:The number of cell phone users reached about 100 million. C:More cell phones were used to call 911 when accidents occurred. D:Cell phones enabled people to have quick access to 911 services.