G)SimpliSafe was singled out in one recent article on jamming,complete with a video showing the entire system being effectively bypassed with handheld jamming equipment.After taking appropriate measure to contain the RF interference to our test lab,we tested the attack out for ourselves,and were able to verify that it is possible with the right equipment.However,we also verified that 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 it 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 a 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 not 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.

【答案】I

37.Interfering with a wireless security system is similar to interfering with a conversation.

【答案】D

38.A burglar has to continuously jam the wireless security device to avoid triggering the alarm,both inside and outside the house.

【答案】J

39.SimpliSafe provides devices that are able to distinguish incidental radio interference from targeted jamming attacks.

【答案】F

40.Only a very small proportion of burglaries are committed by technical means.

【答案】B

41.It is difficult to crack SimpliSafe as its system keeps changing.

【答案】H

42.Wireless devices will transmit signals so as to activate the alarm once something wrong is detected.

【答案】C

43.Different measures should be taken to protect one’s home from burglary in addition to the wireless security system.

【答案】K

44.SimpliSafe’s device can send a warning to the house owner’s cellphone.

【答案】G

45.Burglars can easily get a security device’s frequency by Internet search.

【答案】E

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 up-front 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.