Imagine you're applying for an ideal postion, and you have to write a cover letter as part of your application.

a small part of Einsteins special theory of relativity. Now, dont worry. Ill explain things really, really slowly, and use plenty of examples. OK, first, you have to understand the idea that there are things called frames of reference. Imagine that you are on an elevator. In that box, thats one frame. of reference. And as you go from the first floor to the third, you pass by some guy standing on the second floor. That second floor, thats another frame. of reference. Frame. of reference just means, then, the place where a person is standing. S1 Is there one perfect frame. of reference？ P Good question. Nope. There are no stable frames. All of them move in some way. Now listen to this. Imagine that youre in your living room and you have a block of wood. If you measure the wood sitting on your couch, or if you measure it while riding on a bus, the block of wood will have the same measurements. Let me add here that we have to assume that the bus is going down a nice straight, smooth road and at a constant speed. OK, heres the first part of what Einstein was talking about. The laws of physics are true in all frames of reference. S1 So, that block of wood is going to be the same size in your living room or on the bus？ P Right. Now youll really have to pay attention. Imagine that youre driving in a car and the car is going 50 mph. You throw a rock out the front at 20 mph. In your frame. of reference, the rock is going 20 mph. What about some guy standing by the side of the road？ Remember that hes in a different frame. of reference. Right？ Well, the speed of the car and the speed of the rock together equal 70 mph, and thats the speed hell see the rock moving. S2 What happens if youre in that same car, still going along at 50 mph, and you turn on the headlights？ Doesnt light always have the same speed？ But, wouldnt it be like the rock, the speed of light plus the speed of the car？ P Well, think about speed. Speed is distance divided by time. OK. Heres another crazy part. Distance and time change when things start getting close to the speed of light. How about distance？ Well the faster an object moves, the shorter it gets. Say you buy a really nice limousine, and you want to drive it around and show it off. Well, drive it slowly, because the faster you drive, the shorter the car will appear to the people on the street. You see the car, in your frame. of reference, as staying the same length as when you bought it. The people on the street, standing there in a different frame. of reference, see it as shorter than you do. S2 What about time？ P Lets say you have two frames of reference. One is a guy standing on the ground and the other is a guy flying in a super fast airplane. The guy on the ground sees the guy in the super fast plane as moving slower in time. Thats crazy, right？ Listen one more time. From the point of reference of the guy on the ground, the guy in the plane goes through time slower. So, how does light maintain the same speed no matter what the frame. of reference？ Why is the light from the headlights not moving at the speed of light plus the 50 mph from the car？ Well, its because distance and time, the things we use to measure speed, begin to change once we start to move really, really quickly. Its totally crazy, right？ OK. Any questions？ P Why is the light from the headlights not moving at the speed of light plus the 50 mph from the car？ Well, its because distance and time, the things we use to measure speed, begin to change once we start to move really, really quickly. Its totally crazy, right？ Why does the professor say this: P Its totally crazy, right？

What is the lecture mainly about？

A．Special theory of relativity

B．A property of light

C．Definitions of speed

D．Frames of reference

a small part of Einsteins special theory of relativity. Now, dont worry. Ill explain things really, really slowly, and use plenty of examples. OK, first, you have to understand the idea that there are things called frames of reference. Imagine that you are on an elevator. In that box, thats one frame. of reference. And as you go from the first floor to the third, you pass by some guy standing on the second floor. That second floor, thats another frame. of reference. Frame. of reference just means, then, the place where a person is standing. S1 Is there one perfect frame. of reference？ P Good question. Nope. There are no stable frames. All of them move in some way. Now listen to this. Imagine that youre in your living room and you have a block of wood. If you measure the wood sitting on your couch, or if you measure it while riding on a bus, the block of wood will have the same measurements. Let me add here that we have to assume that the bus is going down a nice straight, smooth road and at a constant speed. OK, heres the first part of what Einstein was talking about. The laws of physics are true in all frames of reference. S1 So, that block of wood is going to be the same size in your living room or on the bus？ P Right. Now youll really have to pay attention. Imagine that youre driving in a car and the car is going 50 mph. You throw a rock out the front at 20 mph. In your frame. of reference, the rock is going 20 mph. What about some guy standing by the side of the road？ Remember that hes in a different frame. of reference. Right？ Well, the speed of the car and the speed of the rock together equal 70 mph, and thats the speed hell see the rock moving. S2 What happens if youre in that same car, still going along at 50 mph, and you turn on the headlights？ Doesnt light always have the same speed？ But, wouldnt it be like the rock, the speed of light plus the speed of the car？ P Well, think about speed. Speed is distance divided by time. OK. Heres another crazy part. Distance and time change when things start getting close to the speed of light. How about distance？ Well the faster an object moves, the shorter it gets. Say you buy a really nice limousine, and you want to drive it around and show it off. Well, drive it slowly, because the faster you drive, the shorter the car will appear to the people on the street. You see the car, in your frame. of reference, as staying the same length as when you bought it. The people on the street, standing there in a different frame. of reference, see it as shorter than you do. S2 What about time？ P Lets say you have two frames of reference. One is a guy standing on the ground and the other is a guy flying in a super fast airplane. The guy on the ground sees the guy in the super fast plane as moving slower in time. Thats crazy, right？ Listen one more time. From the point of reference of the guy on the ground, the guy in the plane goes through time slower. So, how does light maintain the same speed no matter what the frame. of reference？ Why is the light from the headlights not moving at the speed of light plus the 50 mph from the car？ Well, its because distance and time, the things we use to measure speed, begin to change once we start to move really, really quickly. Its totally crazy, right？ OK. Any questions？ P Why is the light from the headlights not moving at the speed of light plus the 50 mph from the car？ Well, its because distance and time, the things we use to measure speed, begin to change once we start to move really, really quickly. Its totally crazy, right？ Why does the professor say this: P Its totally crazy, right？

What is the lecture mainly about？

A．Special theory of relativity

B．A property of light

C．Definitions of speed

D．Frames of reference

been halved. No, youre not an investor in one of those hedge funds that failed completely. With the dollar slumping to a 26-year low against the pound, already- expensive London has become quite unaffordable. A coffee at Starbucks, just as unavoidable in England as it is in the United States, runs about $8. The once all-powerful dollar isnt doing a Titanic against just the pound. It is sitting at a record low against the euro and at a 30-year low against the Canadian dollar. Even the Argentine peso and Brazilian real are thriving against the dollar. The weak dollar is a source of humiliation (屈辱), for a nations self-esteem rests in part on the strength of its currency. Its also a potential economic problem, since a declining dollar makes imported food more expensive and exerts upward pressure on interest rates. And yet there are substantial sectors of the vast U.S. economy--from giant companies like Coca-Cola to morn-and-pop restaurant operators in Miami--for which the weak dollar is most excellent news. Many Europeans may view the U.S. as an arrogant superpower that has become hostile to foreigners. But nothing makes people think more warmly of the U.S. than a weak dollar. Through April, the total number of visitors from abroad was up 6.8 percent from last year. Should the trend continue, the number of tourists this year will finally top the 2000 peak. Many Europeans now apparently view the U.S. the way many Americans view Mexico--as a cheap place to vacation, shop and party, all while ignoring the fact that the poorer locals cant afford to join the merrymaking. The money tourists spend helps decrease our chronic trade deficit. So do exports, which, thanks in part to the weak dollar, soared 11 percent between May 2006 and May 2007. For the first five months of 2007, the trade deficit actually fell 7 percent from 2006. If you own shares in large American corporations, youre a winner in the weak-dollsr gamble. Last week Coca-Colas stock bubbled to a five-year high after it reported a fantastic quarter. Foreign sales accounted for 65 percent of Cokes beverage (饮料) business. Other American companies profiting from this trend include McDonalds and IBM. American tourists, however, shouldnt expect any relief soon. The dollar lost strength the way many marriages break up--slowly, and then all at once. And currencies dont turn on a dime. So if you want to avoid the pain inflicted by the increasingly pathetic dollar, cancel that summer vacation to England and look to New England. There, the dollar is still treated with a little respect. Why do Americans feel humiliated？

A.Their economy is plunging.

B.Their currency has slumped.

C.They cant afford trips to Europe.

D.They have lost half of their assets.

his number would help determine【C1】______you receive a job, a hotel-room upgrade or free samples at the supermarket. If your influence score is【C2】______, you dont get the promotion, the suite or the cookies without charge. This is not science fiction. Its happening to millions of social network users. If you have a Facebook, Twitter or LinkedIn account, you are already being【C3】______—or will be soon. Companies【C4】______names like Klout, Peerlndex and Twitter Grader are in the【C5】______of scoring millions, eventually billions, of people on their【C6】______of influence. Yet the companies are not simply looking at the number of【C7】______or friends youve gathered.【C8】______, they are beginning to measure influence in more【C9】______ways, and posting their judgments—in the form. of a score— online. To some, its an inspiring tool—one thats【C10】______the democratization of influence. No longer must you be a public【C11】______, a politician or a media personality to be【C12】______influential. Social scoring can also help build a personal brand. To critics, social scoring is a brave new technoworld, where your rating could help【C13】______how well you are treated by everyone with whom you【C14】______. Influence scores typically range from 1 to 100. On Klout, the dominant player in this space, the average score is in the high teens. A score in the 40s【C15】______a strong following. A 100, on the other hand, means youre Justin Bieber. On Peerlndex, the average score is 19. A(n)【C16】______100, the company says, is "god-like." Companies are still improving their methodologies—examining through data and【C17】______other networking sites. Industry professionals say its important to focus your digital presence on one or two areas of interest. Dont be a generalist. Most importantly: be passionate, knowledgeable and trustworthy. 【C18】______, scoring is subjective and, for now, imperfect: most analytics companies rely heavily on a users Twitter and Facebook【C19】______, leaving out other online activities, like blogging or posting YouTube videos.【C20】______influence in the offline world—it doesnt count.

【C1】

A．whether

B．unless

C．since

D．that

nimals in terms of their survival？ Anyone？ No？ OK. Well, on a very basic level, the most important things for them are the same as the most important things for the average real estate agent: location, location, and location. That was a little bit of a ... uh ... joke, but there is also a lot of truth to it. Let me explain. Look, imagine you have a small area with a lot of different types of monkeys all living there. Thats a good example, actually, because trade between Diana and putty-nosed monkeys is the topic for today. The monkeys will arrange themselves into groups according to species. All the A monkeys are together and so are all the B monkeys. This allows them to work together to get food and protect themselves. But, the area is small, and this puts all of the groups into competition for food and space, which are both in limited supply. So, where each group is in that space is really important, because its related to how much food it can collect and how safe it will be. See what I mean？ The most important things are location, location, and location. Right. Lets look specifically at the putty-nosed and Diana monkeys that live in a small area in the rainforests along the Ivory Coast in West Africa. They live in the same area and have a serious problem: both of them eat vegetation found high up in trees. This situation should make for a lot of small "wars" between the groups. They are both in the same spot and they both want the same thing. What do they do？ Well, with other monkeys, the Diana monkeys tend to establish borders. Basically, after a certain amount of fighting, the two groups stake out and patrol a group of trees for themselves. The advantage is that once these borders are established, everyone can spend their time finding food. Please dont think that the little countries dont allow some "immigrants." The Diana monkeys, for example, dont care about Campbell monkeys. They let them into their protected areas all the time. Why？ Well, like I said, the Diana monkeys look for food high up in the trees, while the Campbell monkeys tend to forage for food closer to the forest floor. There is no competition between the groups, so there is no fighting. What about the putty-nosed monkeys？ Lets review what we know. Diana monkeys will make borders with other groups that compete for the same food in the same area. But, the borders they make are porous; any group that eats a different type of food can cross into the Diana monkeys territory. What about our friends the putty-nosed？ Well, I imagine youre all expecting some sort of answer like: they fight with the Diana monkeys. Well, youre wrong. There is no fighting between the two groups and no borders are established. Why？ Its sort of the price they willingly pay for the service the putty-nosed monkeys provide. You could call it "rainforest economics." Between the two groups, a situation has developed where both groups are willing to give something they have in exchange for something they want. Look, when not worrying about other groups of monkeys, the Diana monkeys spend a lot of time trying to protect themselves from eagles by running away. Heres an important fact, though: Diana monkeys are not very good at knowing when to run. They have a hard time noticing the eagles, which can fly really quickly and silently. Putty-nosed monkeys, on the other hand, are really good at eagle detection. With better hearing and sight, they act like early warning radar. As soon as an eagle comes close, a putty-nosed monkey will let out a shrill yell that is heard and then repeated by other monkeys in its group. The Diana monkeys all run away to safety, with the putty-nosed monkeys staying where they are; eagles cannot eat the larger, stronger putty-nosed monkeys. There is no fighting between the two groups and no borders are established. Why？ Its sort of the price they willingly pay for the service the putty-nosed monkeys provide. You could call it "rainforest economics." Between the two groups, a situation has developed where both groups are willing to give something they have in exchange for something they want. Why does the professor say this: You could call it "rainforest economics."

What is the lecture mainly about？

A．Real estate prices.

B．Campbell monkeys" eating habits.

C．The interactions of various species.

D．The relationship between Diana and putty-nosed monkeys.

A.which

B.that

C.as

D.what

e you hurry, ______.youre likely to mke less progress B．the less youre likely to mke progress C．so youre less likely to mkeny progress D．the less progress youre likely to mke

A．you are likely to make less progress

B．the less you are likely to make progress

C．so you are less likely to make any progress

D．the less progress you are likely to make

A.No, I am

B.Yes, I’m not

C.Yes, I am

D.Yes, you are

A.So, youre cleaning your bike

B.Hello, youre doing a good job

C.Hello, youre a capable man

D.So, your bike is dirty

Nowdys，people usully think if you enter key university，youre your prents’________． [ ]pride B．luck C．vlue D．cheer

A．pride

B．luck

C．value

D．cheer

eB．Success is how youre viewed by others, _______chievement is something you do yourself.while B．in cse C．even if D．s longs

A．while

B．in case

C．even if

D．as long as