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An Intelligent CarDriving needs sharp eyes, keen ears, quick brain, and coordination(协调) between hands and the brain. Many human drivers have all (51) and can control a fast-moving ear. But how does an intelligent car control itself?There is a virtual(虚拟) driver in the smart car. This virtual driver has "eyes", "brains", "hands" and "feet" too. The minicameras (52) each side of the ear are his "eyes" which (53) the road conditions ahead of it. They watch the (54) to the car’s left and right. There is also a highly automatic driving (55) in the car. It is the built-in computer, which is the virtual driver’s "brain". His "brain" (56) the speeds of other moving cars near it and analyzes their positions. Basing on this information, it chooses the (57) path for the intelligent ear, and gives instructions to the "hands" and "feet" to act accordingly. In this way, the virtual driver (58) his car.What is the virtual driver’s best advantage He reacts (59) . The minicameras are bringing (60) continuously to the "brain". It completes the processing of the images with-in 100 milliseconds. (61) , the world’s best driver needs at least one second to react. Besides, when he takes (62) , he needs one more second.The virtual driver is really wonderful. He can reduce the accident (63) considerably on expressways(高速公路). In this (64) , can we let him have the wheel at any time and in any place Experts (65) that we cannot do that just yet. His ability to recognize things is still limited. He can now only drive an intelligent car on expressways. 57（）
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第二篇Good Table MannersManners play an important part in making a favorable impression at the dinner table. Here are some general rules:Napkin (餐巾) useThe meal begins when the host unfolds his or her napkin. This is your signal to do the same, so place your napkin on your lap. Unfold it completely if it is a small napkin, or in half, lengthwise (纵向地), if it is a large dinner napkin.If you need to leave the table during the meal, place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over, place your napkin neatly on the table to the right of your dinner plate. Do not refold it.Use a napkin only for your mouth. Never use it for your nose, face or forehead.Use of utensils (餐具)Start with the knife, fork or spoon furthest from your plate, and work your way in, using one utensil for each course.If soup is served, remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead, fill a soup spoon about 75 per cent with soup, and sip (啜饮) it from the side noiselessly.After finishing dinner, place the knife and fork parallel to one another across the Plate with the knife alade facing inward toward the plate.Using your f’ingersHere’s a list of finger foods: sandwiches, cookies, small fruits or berries with stems, French fries and potato chips, hamburgers.Chew(咀嚼) with your mouth closed and don’t make noise; don’t talk with your mouth full.Bread must be broken with your hands. It is never cut with a knife.Don’t pick something out of your teeth. Instead, excuse yourself to the bathroom.If possible, try not to cough at the table.Do not put your elbows(肘) on the table. In France, it is essential to have both hands above the table at the same time.Do not put bones or anything else on the table. Things that are not eaten should be put on your plate. All of the following are finger foods except（）.
An Intelligent CarDriving needs sharp eyes, keen ears, quick brain, and coordination(协调) between hands and the brain. Many human drivers have all (51) and can control a fast-moving ear. But how does an intelligent car control itself?There is a virtual(虚拟) driver in the smart car. This virtual driver has "eyes", "brains", "hands" and "feet" too. The minicameras (52) each side of the ear are his "eyes" which (53) the road conditions ahead of it. They watch the (54) to the car’s left and right. There is also a highly automatic driving (55) in the car. It is the built-in computer, which is the virtual driver’s "brain". His "brain" (56) the speeds of other moving cars near it and analyzes their positions. Basing on this information, it chooses the (57) path for the intelligent ear, and gives instructions to the "hands" and "feet" to act accordingly. In this way, the virtual driver (58) his car.What is the virtual driver’s best advantage He reacts (59) . The minicameras are bringing (60) continuously to the "brain". It completes the processing of the images with-in 100 milliseconds. (61) , the world’s best driver needs at least one second to react. Besides, when he takes (62) , he needs one more second.The virtual driver is really wonderful. He can reduce the accident (63) considerably on expressways(高速公路). In this (64) , can we let him have the wheel at any time and in any place Experts (65) that we cannot do that just yet. His ability to recognize things is still limited. He can now only drive an intelligent car on expressways. 59（）
Black HolesMost scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite(无限的)density(稠密), This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist, they are difficult to observe. These are the reasons.· No light or anything else comes out of black holes. As a result, they are invisible to a telescope.· In astronomical terms, black holes are truly. For example, a black hole formed by the collapse of a giant star would have an event horizon(视界) only 18 miles across.· The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion (万亿) miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found, however, so black holes remain one of the mysteries of the universe. The attraction of two large stars leads to gravity.（）
第一篇Motoring Technology1.2 million road deaths worldwide occur each year, plus a further 50 million injuries. To reduce car crash rate, much research now is focused on safety and new fuels, though some electric vehicle and biofuel research aims at going faster.Traveling at speed has always been dangerous. One advanced area of research in motoring safety is the use of digital in-car assistants. They can ensure you don’t miss important road signs or fall asleep. Most crashes result from human and not mechanical faults.Some safety developments aim to improve your vision. Radar can spot obstacles in fog, while other technology "sees through" big vehicles blocking your view.And improvements to seat belts, pedal (脚踏)controls and tires are making driving smoother and safer. The color of a car has been found to be linked with safety, as have, less surprisingly, size and shape.But whatever is in the fuel tank, you don’t want a thief in the driving seat and there have been many innovations(创新). Satellite tracking and remote communications can also come into play if you crash, automatically calling for help.Accidents cause many traffic jams, but there are more subtle interplays between vehicles that can cause jams even on a clear but busy road. Such jams can be analyzed using statistical tools. Robotic drivers could be programmed to make traffic flow smoothly and will perhaps one day be everyone’s personal chauffeur(司机) , but their latest efforts suggest that won’t be soon. Satellite tracking and remote communication systems can be used to（）.
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