单选题Which of the following statements can be used to summarize the gist from Paragraph 3 to Paragraph 6?

单选题Wang (guest): That was a delicious dinner.Mrs. Willis (hostess) ______. Would you like to go to the living room now? It's more comfortable there.

单选题He didn't know German, ______ made it difficult for him to study at a university in Germany.

单选题To invent the language clock the researchers studied and compared ______.

单选题Two different theoretical explanations seem to be produced by Zimring's analysis. What are they?

单选题 Although most dreams apparently happen ______, dream activity may be provoked by external influences.

单选题Competition, they believe, ______ the national character rather than corrupts it.

单选题Hersenseofinferiority______herunfortunatefamilybackground.

单选题The Canadian flag has a ______ leaf on it.

单选题The prescription privileges of psychologists is probably NOT the cause for ______.

单选题I remember he's written a book ______ I've completely forgotten. A. which name B. the name which C. the name of it D. whose name

单选题The reason _______he explained is not I expected.

单选题The poor lady was too______and distressed to talk about the tragedy.

单选题It's true that the old road is less direct and a bit longer. We won't take the new one. ______, because we don't feel as safe on it.

单选题 Most of us know to stay low .to the floor if we're caught in a fire, or head to the basement if a storm's coming, or board up the windows in a hurricane. But because relatively few of us live along fault lines, the massive earthquake that hit Haiti was a reminder that we're far less experienced in what to do when the ground below us shakes. If we're in a house or building, for example, our first impulse might be to run outside—but, counterintuitive (与直觉相反的) as it might sound, experts warn against that since people are too often killed by falling or fallen objects as they try to escape. Of course, just as the best way to survive car crashes is to make safer cars, the best way to reduce the risk of being killed in an earthquake is to enact stronger building codes. But given how many of us travel in quake-prone regions today—including, tragically, the four students and two professors from Lynn University in Florida who perished in the Haiti quake—even folks who don't reside in California should know how to survive an earthquake. But there are two different, and at times competing, schools of thought on the matter—both of which are considered valid but perhaps not always in the same situations. The most conventional and widely accepted practice by the disaster-response community is the 'drop, cover and hold on' approach, which urges people to take cover beneath something like a heavy table to avoid falling objects. The newer method—and less researched—is known as the 'triangle of life.' It recommends lying down in a fetal position not under but next to furniture; as roofs and walls collapse on the top of those sofas and desks, buffer (缓冲) spaces are created that protect people from being crushed. Over the past decade, a consensus has been building that 'drop, cover and hold on' is a more appropriate method for developed countries like the U.S., where improved construction has greatly reduced the likelihood of structures collapsing inwards. The triangle of life is thought to be more suitable in developing nations like Haiti, where inferior building codes make finding a 'survivable void' inside collapsed buildings more important than shielding yourself from falling pieces. 'You have to think about the hazard level of the area you're in,' says Gary Patterson, a geologist and director of education and outreach at the Center for Earthquake Research Information at the University of Memphis in Tennessee. 'ff you're going to play the odds, drop and cover may be the best way to go, but a lot of emergency responders might say triangle of life because they're the ones who see the fatalities in buildings that do collapse.'

单选题However, growth in the fabricated metals industry was able to ______ some of the decline in the iron and steel industry.

单选题The salmon spends its adult life in rivers and seas, but ______ .

单选题 Can Burglars Jam Your Wireless Security System? A. Any product that promises to protect your home deserves careful examination. So it isn't surprising that you'll find plenty of strong opinions about the potential vulnerabilities of popular home-security systems. B. The most likely type of burglary (入室盗窃) by far is the unsophisticated crime of opportunity, usually involving a broken window or some forced entry. According to the FBI, crimes like these accounted for roughly two-thirds of all household burglaries in the US in 2013. The wide majority of the rest were illegal, unforced entries that resulted from something like a window being left open. The odds of a criminal using technical means to bypass a security system are so small that the FBI doesn't even track those statistics. C. One of the main theoretical home-security concerns is whether or not a given system is vulnerable to being blocked from working altogether. With wired setups, the fear is that a burglar (入室盗窃) might be able to shut your system down simply by cutting the right cable. With a wireless setup, you stick battery-powered sensors up around your home that keep an eye on windows, doors, motion, and more. If they detect something wrong while the system is armed, they'll transmit a wireless alert signal to a base station that will then raise the alarm. That approach will eliminate most cord-cutting concerns—but what about their wireless equivalent, jamming? With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station? D. Jamming concerns are nothing new, and they're not unique to security systems. Any device that's built to receive a wireless signal at a specific frequency can be overwhelmed by a stronger signal coming in on the same frequency. For comparison, let's say you wanted to 'jam' a conversation between two people all you'd need to do is yell in the listener's ear. E. Security devices are required to list the frequencies they broadcast on—that means that a potential thief can find what they need to know with minimal Googling. They will, however, need to know what system they're looking for. If you have a sign in your yard declaring what setup you use, that'd point them in the right direction, though at that point, we're talking about a highly targeted, semi-sophisticated attack, and not the sort of forced-entry attack that makes up the majority of burglaries. It's easier to find and acquire jamming equipment for some frequencies than it is for others. F. Wireless security providers will often take steps to help combat the threat of jamming attacks. SimpliSafe, winner of our Editors' Choice distinction, utilizes a special system that's capable of separating incidental RF interference from targeted jamming attacks. When the system thinks it's being jammed, it'll notify you via push alert (推送警报). From there, it's up to you to sound the alarm manually. 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 measures to contain the RF interference to our test lab, we tested the attack out for ourselves, and were able to verify that it's 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 knowhow, 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.

单选题All the parts of this washing machine are ______, so that it is very convenient to replace any of them.