单选题From the first sentence of the third paragraph, we learn that _______.

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单选题60% of those______in the research thought the noise levels of the traffic had increased. [A] questioning [B] questioned [C] question [D] to question

单选题Although only of _________ intelligence, this young man speaks three languages fluently.

单选题It's ten years since the scientist ______on his life's work of discovering the valuable chemical element.

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单选题The Earth has been stripped of up to 90% of its species five times before in the past 450 million years. Now it"s about to happen again—and this time there"s no rogue asteroid (小行星) to blame. One of the first great roles of terrestrial biology is that no species is forever. The Earth has gone through five major extinction events before. The result of all of the extinctions was the same: death, a lot of it. As increasingly accepted theories have argued—and as the Science papers show— we are now in the midst of the sixth great extinction, the unsettlingly-named Anthropocene (人类纪), or the age of the humans. As the authors of all this loss, we are doing ore" nasty work in a lot of ways. Overexploitation—which is to say killing animals for food, clothing or the sheer perverse pleasure of it—plays a big role. So we get elephants slaughtered for their tusks, rhinos poached (偷猎) for their horns and tigers shot and skinned for their pelts, until oops—no more elephants, rhinos or tigers. Habitat destruction is another big driver, particularly in rainforests. And you don"t even have to chop or burn an ecosystem completely away to threaten its species; sometimes all it takes is cutting a few roads across it or building a few farms or homes in the wrong spots. Then too there is global warming, which makes once-hospitable habitats too hot or dry or stormy for species adapted to different conditions. Finally, as TIME"s Bryan Walsh wrote in last week"s cover story, there are invasive species—pests like the giant African snail, the lionfish—which hitch a ride into a new ecosystem on ships or packing material, or are brought in as pets, and then reproduce wildly, crowding out native species. It oughtn"t to take appealing to our self-interest to get us to quit making such a mess of what we"re increasingly coming to learn is an exceedingly destructible world. But it"s that very self-interest that led us to make that mess in the first place. We can either start to change our ways, or we can keep going the way we are—at least until the Anthropocene extinction claims one final species: our own.

单选题Questions 22 to 25 are based on the conversation you have just heard.

单选题Questions 30 to 32 are based on the passage you have just heard.

单选题_______ in 1943 _______ the harmful smog made its appearance in Los Angles.

单选题{{B}}Passage Two{{/B}} {{B}} Questions 62 to 66 are based on the following passage.{{/B}} To say that the child learns by imitation and that the way to teach is to set a good example is a bit oversimplified. No child imitates every action he sees. Sometimes, the example the parent wants him to follow is ignored while he takes over contrary patterns from some other ' example. Therefore we must turn to a more subtle theory than "Monkey see, monkey do". Look at it from the child's point of view. Here he is in a new situation, lacking a ready response. He is seeking a response which will gain certain ends. If he lacks a ready response for the situation, and cannot reason out what to do, he observes a model who seems able to get the right result. The child looks for an authority or expert who can show what to do. There is a second element at work in this situation. The child may be able to attain his immediate goal only to find that his method brings criticism from people who observe him. When shouting across the house achieves his immediate end of delivering a message, he is told emphatically that such a racket is unpleasant, that he should walk into the next room and say his say quietly. Thus, the desire to solve any objective situation is overlaid with the desire to solve it properly. One of the early things the child learns is that he gets more affection and approval when his parents like his response. Then other adults reward some actions and criticize others. If one is to maintain the support of others and his own self-respect, he must adopt responses his social group approves. In finding trial responses, the learner does not choose models at random. He imitates the person who seems a good person to be like, rather than a person whose social status he wished to avoid. If the pupil wants to be a good violinist, he will observe and try to copy the techniques of capable players; while some other person may most influence his approach to books. Admiration of one quality often leads us to admire a person as a whole, and he becomes an identifying figure. We use some people as models over a wide range of situations, imitating much that they do. We learn that they are dependable and rewarding models because imitating them leads to success.

单选题I'd like to take advantage of this opportunity to express my sincere ______ for your help.

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单选题Paragraph 1 Junk food is everywhere. We"re eating way too much of it. Most of us know what we"re doing and yet we do it anyway. Paragraph 2 So here"s a suggestion offered by two researchers at the Rand Corporation: Why not take a lesson from alcohol control policies and apply them to where food is sold and how it"s displayed? Paragraph 3 "Many policy measures to control obesity (肥胖症) assume that people consciously and rationally choose what and how much they eat and therefore focus on providing information and more access to healthier foods," note the two researchers. Paragraph 4 "In contrast," the researchers continue, "many regulations that don"t assume people make rational choices have been successfully applied to control alcohol, a substance—like food—of which immoderate consumption leads to serious health problems." Paragraph 5 The research references studies of people"s behavior with food and alcohol and results of alcohol restrictions, and then lists five regulations that the researchers think might be promising if applied to junk foods. Among them: Paragraph 6 Density restrictions: licenses to sell alcohol aren"t handed out unplanned to all comers but are allotted (分配) based on the number of places in an area that already sell alcohol. These make alcohol less easy to get and reduce the number of psychological cues to drink. Paragraph 7 Similarly, the researchers say, being presented with junk food stimulates our desire to eat it. So why not limit the density of food outlets, particularly ones that sell food rich in empty calories? And why not limit sale of food in places that aren"t primarily food stores? Paragraph 8 Display and sales restrictions: California has a rule prohibiting alcohol displays near the cash registers in gas stations, and in most places you can"t buy alcohol at drive-through facilities. At supermarkets, food companies pay to have their wares in places where they"re easily seen. One could remove junk food to the back of the store and ban them from the shelves at checkout lines. The other measures include restricting portion sizes, taxing and prohibiting special price deals for junk foods, and placing warning labels on the products.

单选题Consumers usually don't know ____________.