单选题It doesn"t stand to reason that he would lie.

单选题This book embraces many subjects.A. adoptsB. coversC. pressesD. accepts

单选题Even in a highly modernized country, manual work is still needed.

单选题Tell me the exact time when the next train will arrive.A. awareB. accurateC. actualD. abmad

单选题The use of the chemical may present a certain hazard to the laboratory workers.

单选题he 1994 survey showed most Americans thought the middle class

单选题Do you ever feel angry about someone who stands too close, talks too loudly or makes eye contact for too long? Why do we feel uncomfortable with those" close talkers"? Or with strangers who stand very near to us in a line? Scholars began to study personal space decades ago. They found that humans tend to avoid eye contact if they feel someone is standing too close. They put a distance between themselves and strangers. According to scientists, personal space involves not only an imaginary space around the body, but around all the senses. People may feel their space is being violated when they encounter an unwelcome sound, scent or stare: the woman on the bus shouting into her mobile phone or the coworker sitting next to you putting on some perfume you don't like. What is the author's attitude towards people shouting on the bus?A. HostileB. FriendlyC. CriticalD. Indifferent

单选题The team's spirit was at the lowest point in the season.

单选题She will be {{U}}pleased {{/U}}to meet you．

单选题Theories of teaching have not been as fully developed as have theories of learning.

单选题They are endeavoring to change society as a whole.

单选题I am {{U}}not willing{{/U}} to concede that I have hurt her, because that's not my real intention.

单选题The Drive for the Future Driverless ears Professor Sebastian Thrun, director of the Stanford Artificial Intelligence Laboratory, wants to cut the number of ears on planet earth by 50%. He said: "It's a huge waste of money and resources to do so—we use ears about 3% of the time. " Professor Thrun is a leader in the field of driverless Cars and has built two robotic vehiclescalled Stanley and Junior. The cars have no human driver and no remote control system—everything from sensors to navigation is handled by an onboard computer. They were both entered into the DARPA Grand Challenge—a race for autonomous vehicles. Stanley won in 2004 and Junior took second place in 2007. But the ultimate goal is to create a world where self - aware vehicles can drive passengers around without hitting pedestrians or bumping into other vehicles. "To be able to understand the environment as deep as humans do is the holy grail of artificial intelligence. " "It's a huge amount of work to make computers understand what is the behaviour of the two people on the right, both waiting at an intersection—will they walk or not? It is a really hard question. " Perfect missions Researchers at Stanford are trying to program helicopters to fly perfect missions every time including loops. Imagine, for example, a search and rescue chopper that can descend into a narrow canyon countless times without its rotors ever touching the edges. Andrew Ng, an associate professor in the Computer Science Department, said it would be very difficult to write software to make a helicopter early out stunts in the air. Instead, researchers asked a expert human pilot to demonstrate the stunts. The computer learned from the demonstrations how to fly by itself. It is called apprenticeship learning—the computer figures out what the human pilot is trying to do and then uses algorithms to correct or perfect the operations. Professor Ng said:" The accelerometers of the helicopter will feel the force of the wind pushing the helicopter aside and what the helicopter has learned to do is how to adjust the controls to move itself back onto the desired flight path. /

单选题The White House We got up early this morning and (1) a long walk after breakfast. We walked through the business section of the city. I told you yesterday that the city was larger (2) I thought it would be. (3) the business section is smaller than I thought it would be. I suppose that's (4) Washington is a special kind of city. (5) the people in Washington work for the government. About 9:30 we went to the White House. It's (6) to the public from 10 till 12, and there was a long line of people waiting to get in. We didn't have to wait very long, because the line moved (7) quickly. The White House is really white. It is painted every year. And it seems very white, because it's got beautiful lawns ail around it, (8) many trees and shrubs. The grounds (9) about four square blocks. I mean, they're about two blocks long (10) each side. The part (11) the President lives and works is not open to the public. But the part we saw was beautiful. We went through five of the main rooms. One of them was the library, on the ground floor. On the next floor, there are three rooms named (12) the colors that are used in them: the Red Room, the Blue Room and the Green Room. The walls are covered with silk (13) .There are (14) old furniture, from the time (15) the White House was first built. And everywhere there are paintings and statues of former presidents and other famous people from history.

单选题The weather is a constant subject of conversation in Britain.

单选题His boss {{U}}took him to task{{/U}} for his habitual lack of punctuality.

单选题At the age of 12, the author got a job at a restaurant and often worked till late at night because

单选题Our correspondent Carl from South Africa will give us a brief introduction of their presidential election.A. reporterB. representativeC. writerD. interpreter

单选题Don't Count on Dung (粪) Conservationists (自然保护主义者) may be miscalculating the numbers of the threatened animals such as elephants, say African and American researchers. The error occurs because of a flaw in the way they estimate animal numbers from the piles of dung the creatures leave behind. The mistake could lead researchers to think that there are twice as many elephants as there really are in some regions according to Andrew Plumptre of the Wildlife Conservation Society (WCS) in New York. Biologist Katy Payne of Comell University in Ithaca, New York, agrees, "We really need to know elephant numbers and the evidence that we have is quite indirect, " says Payne, who electronically tracks elephants. Counting elephants from planes is impossible in the vast rainforests of Central Africa. So researchers often estimate elephant numbers by counting dung piles in a given area. They also need to know the rate at which dung decays because it's extremely difficult to determine these rates. However, researchers counting elephants in one region tend to rely on standard decay rates established elsewhere. But researchers at the WCS have found that this decay rate varies from region to region depending on the climate and environment. Using the wrong values can lead the census astray (离开正道), says Plumptre. He and his colleague Anthony Chifu Nchanji studied decaying elephant dung in the forests of Cameroon. They found that the dung decayed between 55 and 65 per cent more slowly than the dung in the rainforests of neighboring Gabon. If researchers use decay rates from Gabon to count elephants in Cameroon, they would probably find more elephants than are actually around. This could mean estimates in Cameroon are at least twice as high as those derived from decay rates calculated locally, Plumptre says, "However accurate your dung density estimate might be, the decay rate can severely affect the result". Plumptre also says that the dung-pile census should be carried out over a region similar in size to an elephant's natural range. The usual technique of monitoring only small, protected areas distorts numbers because elephants move in and out of these regions, he says, "If the elephant population increases within the protected area, you can not determine whether. It is a real increase or whether it is due to elephants moving in because they are being poached (入侵偷猎) outside." Plumptre says that similar problems may also affect other animal census studies that rely on indirect evidence such as nests, tracks or burrows (地洞).

单选题It is absurd to go out in such terrible weather.A. ridiculousB. funnyC. oddD. interesting