What’s the cause of the crosswalk safety problem according to the test?A. There’re many cars and buses on the road.B. Pedestrians are careless.C. Crosswalks are crowded.D. Drivers don’t give way.

Passage 1Every day 25 million U.S. children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large school buses, and nearly four times that number are killed outside buses in the loading zones. By and large, however, the nation's school children are transported to and from school safety.Even though the number of school bus casualties is not large, the safety of children is always of intense public concern. While everyone wants to see children transported safely, people are divided about what needs to be done particularly whether seat belts should be mandatory.Proponents of seat belts on school buses-many of them parents and medical organizations argue that seat belts are necessary not only to reduce fatality and injury, but also to teach children lessons about the importance of using them routinely in any moving vehicle. A side benefit, they point out, is those seats belts help keep children in their seats, away from the bus driver.Opponents of seat belt installation suggest that children are already well protected by the school buses that adhere to the Nation Highway Traffic Safety Administrations(NHTSA) safety requirements set in 1977. They also believe that many children won't wear seat belts anyway and that may damage the belts or use them as weapons to hurt other children.A new Research Council report on school bus safety suggests that there are alternate safety devices and procedures that may be more effective and less expensive. For example, the study committee suggested that raising seat backs four inches may have the same safety effectiveness as seat belts.The report sponsored by the Department of Transportation at the request of Congress, reviews seat belts extensively while taking a broader look at safety in and around school buses.The title below which best expresses the idea of the passage is___________.

The nfsstat -c command shows zero badxid， but retrans and timeouts are sizeable， what is the most probable cause of the problem？（）

Passage 1Every day 25 million U.S. children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large school buses, and nearly four times that number are killed outside buses in the loading zones. By and large, however, the nation's school children are transported to and from school safety.Even though the number of school bus casualties is not large, the safety of children is always of intense public concern. While everyone wants to see children transported safely, people are divided about what needs to be done particularly whether seat belts should be mandatory.Proponents of seat belts on school buses-many of them parents and medical organizations argue that seat belts are necessary not only to reduce fatality and injury, but also to teach children lessons about the importance of using them routinely in any moving vehicle. A side benefit, they point out, is those seats belts help keep children in their seats, away from the bus driver.Opponents of seat belt installation suggest that children are already well protected by the school buses that adhere to the Nation Highway Traffic Safety Administrations(NHTSA) safety requirements set in 1977. They also believe that many children won't wear seat belts anyway and that may damage the belts or use them as weapons to hurt other children.A new Research Council report on school bus safety suggests that there are alternate safety devices and procedures that may be more effective and less expensive. For example, the study committee suggested that raising seat backs four inches may have the same safety effectiveness as seat belts.The report sponsored by the Department of Transportation at the request of Congress, reviews seat belts extensively while taking a broader look at safety in and around school buses.It may be inferred from this passage that_________.

Passage 1Every day 25 million U.S. children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large school buses, and nearly four times that number are killed outside buses in the loading zones. By and large, however, the nation's school children are transported to and from school safety.Even though the number of school bus casualties is not large, the safety of children is always of intense public concern. While everyone wants to see children transported safely, people are divided about what needs to be done particularly whether seat belts should be mandatory.Proponents of seat belts on school buses-many of them parents and medical organizations argue that seat belts are necessary not only to reduce fatality and injury, but also to teach children lessons about the importance of using them routinely in any moving vehicle. A side benefit, they point out, is those seats belts help keep children in their seats, away from the bus driver.Opponents of seat belt installation suggest that children are already well protected by the school buses that adhere to the Nation Highway Traffic Safety Administrations(NHTSA) safety requirements set in 1977. They also believe that many children won't wear seat belts anyway and that may damage the belts or use them as weapons to hurt other children.A new Research Council report on school bus safety suggests that there are alternate safety devices and procedures that may be more effective and less expensive. For example, the study committee suggested that raising seat backs four inches may have the same safety effectiveness as seat belts.The report sponsored by the Department of Transportation at the request of Congress, reviews seat belts extensively while taking a broader look at safety in and around school buses.According to the passage, who has the greatest degree of control of the school buses safety?

The emergence of the Uber digital tide finder and the regulation questions it tends to raise have inspired debates, protests and supports around the world. The following are comments on legalization of ride-hailing service both from officials and ordinary citizens. Read the excerpts carefully and write your response in about 300 words, in which you should:　　1. summarize briefly the comments from both sides;　　2. give your comment.　　Marks will be awarded for content relevance, content sufficiency, organization and language quality. Failure to follow the above instructions may result in a loss of marks.Government Authorities　　Maranda Gibson, a representative from Los Angeles Department of Transportation: The drivers for Uber are not required to pass background checks or have their vehicles inspected for safety. They don’t have to pay the same taxes, insurance fees and licensing fees that taxi drivers do. While taxi drivers go through an extensive training course called “the Knowledge”, where drivers must learn 320 routes covering 25,000 streets, as well as important buildings and points of interest, Uber drivers can come straight with a car and GPS.　　Boris Johnson, a British politician: I have sympathy for taxi drivers, but it would be “difficult” for the government to ban Uber. We’ve gone to the high court to get a ruling on this, and the issue is basically: is the driver’s mobile in the cab equivalent to a taxi meter? I can see why my learned friends might think that it is, because it’s receiving data about, or it’s calculating, the distance and time and the fare. And there are other lawyers who say that it isn’t, and that was the advice of the counsel to Transport for London. And so we’ve got a legal problem.Ordinary Citizens　　Mary Williams: I think as long as the Uber drivers have the necessary background checks done (they don’t have any warrants, are not reckless drivers, and are properly insured) then they should be allowed to offer their services. The transportation market is changing as it should with technology. I think it’s great that Uber users are able to see their driver’s ratings and can hail them quicker than they can get a cab. It’s just a different way of doing business.　　Matthew Yglesias: I think it’s pretty obvious that Uber does in fact need to be regulated. And regulated pretty heavily. After all, here’s the business: You’ve got people cruising around cities in medium sized metal boxes capable of traveling at high speeds and powered by burning gasoline. Left unregulated, these vehicles would poison the air and crush huge numbers of innocent pedestrians. Which is why it’s good that the federal government regulates what kind of automobiles are considered safe to drive and regulates what kind of vehicle emissions are acceptable, and it’s why state and local governments regulate both who is allowed to drive cars (with driver’s licenses), under what circumstances (with drunk driving laws), and of course what you’re allowed to do with a vehicle (with road rules). These are important things for the government to do.　　Daniel Tencer: The regulatory issue around Uber is whether the rules governing rides-for-hire need to be drastically different than the rules governing driving-yourself-around. But you don’t need rules that specifically discriminate against rides for hire. Anything you want to do around driving yourself is presumptively legal, and you want to do around hiring someone else to drive you is presumptively illegal. But by all means, regulate cars-for-hire, just regulate them the same way you regulate the other cars.

According to the passage, what problem does Sao Paulo have?

Passage 1Every day 25 million U.S. children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large school buses, and nearly four times that number are killed outside buses in the loading zones. By and large, however, the nation's school children are transported to and from school safety.Even though the number of school bus casualties is not large, the safety of children is always of intense public concern. While everyone wants to see children transported safely, people are divided about what needs to be done particularly whether seat belts should be mandatory.Proponents of seat belts on school buses-many of them parents and medical organizations argue that seat belts are necessary not only to reduce fatality and injury, but also to teach children lessons about the importance of using them routinely in any moving vehicle. A side benefit, they point out, is those seats belts help keep children in their seats, away from the bus driver.Opponents of seat belt installation suggest that children are already well protected by the school buses that adhere to the Nation Highway Traffic Safety Administrations(NHTSA) safety requirements set in 1977. They also believe that many children won't wear seat belts anyway and that may damage the belts or use them as weapons to hurt other children.A new Research Council report on school bus safety suggests that there are alternate safety devices and procedures that may be more effective and less expensive. For example, the study committee suggested that raising seat backs four inches may have the same safety effectiveness as seat belts.The report sponsored by the Department of Transportation at the request of Congress, reviews seat belts extensively while taking a broader look at safety in and around school buses.Each year, children killed outside buses in the loading zones, are about________.

Passage 1Every day 25 million U.S. children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large school buses, and nearly four times that number are killed outside buses in the loading zones. By and large, however, the nation's school children are transported to and from school safety.Even though the number of school bus casualties is not large, the safety of children is always of intense public concern. While everyone wants to see children transported safely, people are divided about what needs to be done particularly whether seat belts should be mandatory.Proponents of seat belts on school buses-many of them parents and medical organizations argue that seat belts are necessary not only to reduce fatality and injury, but also to teach children lessons about the importance of using them routinely in any moving vehicle. A side benefit, they point out, is those seats belts help keep children in their seats, away from the bus driver.Opponents of seat belt installation suggest that children are already well protected by the school buses that adhere to the Nation Highway Traffic Safety Administrations(NHTSA) safety requirements set in 1977. They also believe that many children won't wear seat belts anyway and that may damage the belts or use them as weapons to hurt other children.A new Research Council report on school bus safety suggests that there are alternate safety devices and procedures that may be more effective and less expensive. For example, the study committee suggested that raising seat backs four inches may have the same safety effectiveness as seat belts.The report sponsored by the Department of Transportation at the request of Congress, reviews seat belts extensively while taking a broader look at safety in and around school buses.According to the passage, the school bus is________.