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Why do teachers give their students a huge lot of homework and examinations？
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Real World Robots
When you think of a robot， do you envision a shiny， metallic device having the same general shape as a human being， performing humanlike functions， and responding to your questions in a monotone voice accentuated by high-pitched tones and beeps？ This is the way many of us imagine a robot， but in the real world， a robot is not humanoid at all. Instead a robot often is a voiceless， box-shaped machine that efficiently carries out repetitive or dangerous functions usually performed by humans. Today"s robot is more than an automatic machine that performs one task again and again. A modem robot is programmed with varying degrees of artificial intelligence- that is， a robot contains a computer program that tells it how to perform. tasks associated with human intelligence， such as reasoning， drawing conclusions， and learning from past experience.
A robot does not possess a human shape for the simple reason that a two-legged robot has great difficulty remaining balanced. A robot does， however， move from place to place on wheels and axles that roll and rotate. A robot even has limbs that swivel and move in combination with joints and motors. To find its way in its surroundingsl， a robot utilizes various built-in sensors.
Antennae attached to the robot"s base detect anything they bump into. If the robot starts to teeter as it moves on an incline， a gyroscope or a pendulum inside it senses the vertical differential. To determine its distance from an object and how quickly it will reach the object， the robot bounces beams of laser light and ultrasonic sound waves off obstructions in its path. These and other sensors constantly feed information to the computer， which then analyzes the information and corrects or adjusts the robot"s actions. As science and technology advance， the robot too will progress in its functions and use of artificial-intelligence programs.
Another good title for this passage would be___________. 查看材料
The San Ildefonso pueblo is known for 查看材料
Traditional methods of making pottery___________. 查看材料
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Native American Pottery
There are several American Indian groups in the Southwest that still make beautiful pottery.
Some of this pottery may be sold at fairly high prices. But the makers consider their work as more than a commercial enterprise. By using methods handed downfor generations， the potters express their pride in their cultural inheritance （遗产） .
Some of the most interesting pottery is made by the Pueblo Indians. There are 21 individual pueblos in Arizona and New Mexico. Several are famous for their craftsmanship.To make a pot，these potters use a clay base and add long thin coils of clay toit in a spiral pattern. When they have reached the size they want， they use an implement such as a rock or shell to smooth the surfaces of the pot.
How a pot is decorated and fired depends on the traditions of the group making it. Traditional pottery produced by the Acoma， who have lived for centuries on a high mesa in NewMexico， is first painted with a clay slip. The resulting pots: which are prizedfor their delicacy and strength，may be left white. They may also be painted with black and white patterns or with a combination of black， orange， and brown.
Very distinctive （忒别的，有特色的） black pottery comes from the Sail Ildefonso and Santa Clara pueblos. The black color is the result of carbon being released from the animal manure （粪肥） in which the pot is fired. Some artisans hand -rub this ware to a shiny gloss. Others cut patterns into it: resulting in a part shiny: part fiat surface. Potters at Sail lldefonso make many types of wares. Potters at Santa Clara are especially known for wedding jars-jars with two necks connected by a handle.
Other groups such as the Hopi and the Cochiti also make pottery. Each group uses distinctive methods and produces distinctive .forms and designs.
In the first paragraph the word "commercial" means 查看材料
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