SimpliSafe’s anti-jamming system works. It caught us in the act, sent an alert to my smartphone, and also listed our RF interference on the system’s event log. The team behind the article and video in question make no mention of the system, or whether or not in detected them. [H]We like the unique nature of that software. It means that a thief likely wouldn’t be able to Google how the system works, then figure out a way around it. Even if they could, SimpliSafe claims that its system is always evolving, and that it varies slightly from system to system, which means there wouldn’t be a universal magic formula for cracking it. Other systems also seem confident on the subject of jamming. The team at Frontpoint addresses the issue in a blog on its site, citing their own jam protection software and claiming that there aren’t any documented cases of successful jam attack since the company began offering wireless security sensors in the 1980s.
[I] Jamming attacks are absolutely possible. As said before, with the right equipment and the right know-how, it’s possible to jam any wireless transmission. But how probable is it that someone will successfully jam their way into your home and steal your stuff?
[J] Let’s imagine that you live in a small home with a wireless security setup that offers a functional anti-jamming system. First, a thief is going to need to target your home, specifically. Then, he’s going to need to know the technical details of your system and acquire the specific equipment necessary for jamming your specific setup. Presumably, you keep your doors locked at night and while you’re away. So the thief will still need to break in. That means defeating the lock somehow, or breaking a window. He’ll need to be jamming you at this point, as a broken window or opened door would normally release the alarm. So, too, would the motion detectors in your home, so the thief will need to continue jamming once he’s inside and searching for things to steal. However, he’ll need to do so without tripping the anti-jamming system, the details of which he almost certainly does now have access to.
[K]At the end of the day, these kinds of systems are primarily designed to protect against the sort of opportunistic smash-and-grab attack that makes up the majority of burglaries. They’re also only a single layer in what should ideally be a many-sided approach to securing your home, one that includes common sense things like sound locks and proper exterior lighting at night. No system is impenetrable, and none can promise to eliminate the worst case completely. Every one of them has vulnerabilities that a knowledgeable thief could theoretically exploit. A good system is one that keeps that worst-case setting as improbable as possible while also offering strong protection in the event of a less-extraordinary attack. 36. It is possible for burglars to make jamming attacks with the necessary equipment and skill.
37. Interfering with a wireless security system is similar to interfering with a conversation.
38. A burglar has to continuously jam the wireless security device to avoid triggering the alarm, both inside and outside the house.
39. SimpliSafe provides devices that are able to distinguish incidental radio interference from targeted jamming attacks. 40. Only a very small proportion of burglaries are committed by technical means. 41. It is difficult to crack SimpliSafe as its system keeps changing.
42. Wireless devices will transmit signals so as to activate the alarm once something wrong is detected.
43. Different measures should be taken to protect one’s home from burglary in addition to the wireless security system.
44. SimpliSafe’s device can send a warning to the house owner’s cellphone. 45. Burglars can easily get a security device’s frequency by Internet search. Section C
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A),B),C) and D).You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre. Passage One
Questions 46 to 50 are based on the following passage.
As a person who writes about food and drink for a living. I couldn’t tell you the first thing about Bill Perry or whether the beers he sells are that great. But I can tell you that I like this guy. That’s because he plans to ban tipping in favor of paying his servers an actual living wage. I hate tipping.
I hate it because it’s an obligation disguised as an option. I hate it for the post-dinner math it requires of me. But mostly, I hate tipping because I believe I would be in a better place if pay decisions regarding employees were simply left up to their employers, as is the custom in virtually every other industry. Most of you probably think that you hate tipping, too. Research suggests otherwise. You actually love tipping! You like to feel that you have a voice in how much money your server makes. No matter how the math works out, you persistently view restaurants with voluntary tipping systems as being a better value, which makes it extremely difficult for restaurants and bars to do away with the tipping system. One argument that you tend to hear a lot from the pro-tipping crowd seems logical enough: the service is better when waiters depend on tips, presumably because they see a benefit to successfully veiling their contempt for you. Well, if this were true, we would all be slipping a few 100-dollar bills to our doctors on the way out their doors, too. But as it turns out, waiters see only a tiny bump in tips when they do an exceptional job compared to a passable one. Waiters, keen observers of humanity that they are, are catching on to this; in one poll, a full 30% said they didn’t believe the job they did had any impact on the tips they received. So come on, folks: get on board with ditching the outdated tip system. Pay a little more upfront for your beer or burger. Support Bill Perry’s pub , and any other bar or restaurant that doesn’t ask you to do drunken math. 46. What can we learn about Bill Perry from the passage?
A) He runs a pub that serves excellent beer.
B) He intends to get rid of the tipping practice. C) He gives his staff a considerable sum for tips. D) He lives comfortably without getting any tips.
47. What is the main reason why the author hates tipping? A) It sets a bad example for other industries. B) It adds to the burden of ordinary customers. C) It forces the customer to compensate the waiter. D) It poses a great challenge for customers to do math.
48. Why do many people love tipping according to the author?
A) They help improve the quality of the restaurants they dine in. B) They believe waiters deserve such rewards for good service. C) They want to preserve a wonderful tradition of the industry. D) They can have some say in how much their servers earn. 49. What have some waiters come to realize according to a survey? A) Service quality has little effect on tip size. B) It is in human mature to try to save on tips. C) Tips make it more difficult to please customers. D) Tips benefit the boss rather that the employees. 50. What does the author argue for in the passage?
A) Restaurants should calculate the tips for customers. B) Customers should pay more tips to help improve service.
C) Waiters deserve better than just relying on tips for a living. D) Waiters should be paid by employers instead of customers. Passage Two
Questions 51 to 55 are based on the following passage.
In the past, falling oil prices have given a boost to the world economy, but recent forecasts for global growth have been toned down, even as oil prices sink lower and lower. Does that mean the link between lower oil prices and growth has weakened?
Some experts say there are still good reasons to believe cheap oil should heat up the world economy. Consumers have more money in their pockets when they’re paying less at the pump. They spend that money on other things, which stimulates the economy. The biggest gains go to countries that import most of their oil like China, Japan, and India, But doesn’t the extra money in the pockets of those countries’ consumers mean an equal loss in oil producing countries, cancelling out the gains? Not necessarily, says economic researcher Sara Johnson. “Many oil producers built up huge reserve funds when prices were high, so when prices fall they will draw on their reserves to support government spending and subsidies(补贴) for their consumers.”
But not all oil producers have big reserves, In Venezuela, collapsing oil prices have sent its economy into free-fall.
Economist Carl Weinberg believes the negative effects of plunging oil prices are overwhelming the positive effects of cheaper oil. The implication is a sharp
decline in global trade, which has plunged partly because oil-producing nations can’t afford to import as much as they used to.
Sara Johnson acknowledges that the global economic benefit from a fall in oil prices today is likely lower than it was in the past. One reason is that more countries are big oil producers now, so the nations suffering from the price drop account for a larger share of the global economy. Consumers, in the U.S. at least, are acting cautiously with the savings they’re getting at the gas pump, as the memory of the recent great recession is still fresh in their mind. And a number of oil-producing countries are trimming their gasoline subsidies and raising taxes, so the net savings for global consumers is not as big as the oil price plunge might suggest.
51. What does the author mainly discuss in the passage? A) The reasons behind the plunge of oil prices. B) Possible ways to stimulate the global economy. C) The impact of cheap oil on global economic growth. D) The effect of falling oil prices on consumer spending.
52. Why do some experts believe cheap oil will stimulate the global economy? A) Manufacturers can produce consumer goods at a much lower cost.
B) Lower oil prices have always given a big boost to the global economy. C) Oil prices may rise or fall but economic laws are not subject to change. D) Consumers will spend their saving from cheap oil on other commodities. 53. What happens in many oil-exporting countries when oil prices go down? A) They suspend import of necessities from overseas.
B) They reduce production drastically to boost oil prices. C) They use their money reserves to back up consumption. D) They try to stop their economy from going into free-fall. 54. How does Carl Weinberg view the current oil price plunge? A) It is one that has seen no parallel in economic history.
B) Its negative effects more than cancel out its positive effects. C) It still has a chance to give rise to a boom in the global economy. D) Its effects on the global economy go against existing economic laws.
55. Why haven’t falling oil prices boosted the global economy as they did before?
A) People are not spending all the money they save on gas. B) The global economy is likely to undergo another recession.
C) Oil importers account for a larger portion of the global economy. D) People the world over are afraid of a further plunge in oil prices. Part IV Translation (30 minutes)
Directions: For this part, you are allowed 30 minted to translate a passage from Chinese into English. You should write your answer on Answer Sheet 2. 在中国文化中，黄颜色是一种很重要的颜色，因为它具有独特的象征意义。在封建（feudal)社会中，它象征统治者的权力和权威。那时，黄色是专为皇帝使用的颜色，皇家宫殿全都漆成黄色，皇袍总是黄色的，而普通老百姓是禁止穿黄色衣服的。在中国，黄色也是收获的象征。秋天庄稼成熟时，田野变得一片金黄。人们兴高采烈，庆祝丰收。
2016年12月大学英语四级考试真题答案（卷一） Part I Writing (30 minutes) 【参考范文】 Facing the two options, I will choose to take a job in a company. There are mainly two reasons for my choice.
On one hand, I am eager to apply what I’ve learned to practice since I have got so many years’ schooling. Moreover, I am somewhat tired of the “ivory tower” life and ready for the “real world” life, for I assume that I can learn more from getting in touch with society. On the other hand, my family needs my financial support, because my parents are getting older and older and making less and less. Though it doesn’t take much to pursue my further study, I cannot support my parents financially if I choose to go to a graduate school.
To sum up, to take a job in a company meets my desire of learning from practice and support my parents financially, which is a better choice for me. 听力原文： Section A -1
A 16th century castle in Scotland is close to collapsing after lumps of soils were washed away by floods, threatening its foundations.
On Sunday, the castle’s owner John Gordon, 76, was forced to move out his property after the River Dee swept away about 60 feet of land, leaving the castle dangerous close to the river. According to the Scottish Daily Record.
Abergeldie castle located in Aberdeenshire, Scotland was built by Sir Alexander Gordon of Midmar who later became the Earl of Huntly.
The castle which is located on 11,700 acres was leased to members of the royal family between 1848 and 1970, including King Edward VII and George V.
The Scottish Environment Protection Agency has issued more than 35 flood warnings covering several regions, as Scotland continues to clean up the after Storm Frank hit the country last Wednesday. “This means that rivers will rise more slowly, but then stay high for much longer.” the environmental agency said.
Q1. Why did John Gordon move out of Abergeldie castle? Q2. What happened in Scotland last Wednesday? Section A - 2
Rescue efforts were underway Thursday morning for 17 miners who were stuck in an elevator below ground at a Cargill rock salt mine near Lansing, New York, according to Marcia Lynch.
Public information officer with Tompkins County’s emergency response department, emergency workers have made contact with the miners via a radio. And they all appear to be uninjured, said Jessica Verfuss, the emergency department’s assistant director.
Crews have managed to provide heat packs and blankets to the miners so that they can keep warm during the rescue operation, Verfuss said. Details about what led to the workers’ being trapped in the elevator went immediately available. The mine, along New York’s Cayuga Lake, processes salt used for road treatment. It produces
2016年12月大学英语四级考试真题答案
