题目内容
Section A
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
听力原文：M: The switch in the bathroom is broken and we need a socket for the porch light.
W: Why don't you get Mr. Kidder to come and take a look？
Q: What does Mr. Kidder do？
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How has Weihenmeyer climbed mountains？
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Words come from California of a new weapon in the war on household pests. Two scientists working for a firm in Anaheim, California, have developed a method to eliminate insects without using dangerous chemicals. The new poison？ Hot air.
The basic idea is that insects cannot adjust to temperatures much above normal. In laboratory experiments, most of the pests can't survive much more than a quarter of an hour at 125 degrees Fahrenheit, or about 50 degrees centigrade.
The new method involves covering a house with a huge tent and filling it with air heated to around 65 degrees centigrade. Hot air is forced in with fans, and the tent keeps the heat inside the house. Since termites try to escape by hiding in wooden beams, the heat treatment must be continued for a full six hours. But when it’s all over, and the insects are dead, there are not toxic chemicals to endanger humans or pets, and no fumy smells.
Scientists claim that there is no danger of fire, either, since very few household materials will burn at 65 degrees centigrade. In fact, wood is prepared for construction use by drying it in ovens at 80 degrees centigrade, which is substantially hotter than the air used in this procedure.
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Human's Hands
Archaeological records--paintings, drawings, and carvings of humans engaged in activities involving the use of hands--indicate that humans have been predominantly right - handed for more than 5,000 years. In ancient Egyptian artwork, for example, the fight-hand is depicted as the dominant one in about 90 per cent of the examples. Fracture or wear patterns on tools also indicate that a majority of ancient people were fight - handed.
Cro-Magnon cave paintings some 27,000 years old commonly show outlines of human hands made by placing one hand against the cave wall and applying paint with the other. Children today make similar out lines of their hands with crayons on paper. With few exceptions, left hands of Cro-Manganese are displayed on cave walls, indicating thai the paintings were usually done by right-handers.
Anthropological evidence pushes the record of handedness nearly human ancestors back to at least 1.4 million years ago. One important line of evidence comes from flaking patterns of stone cores used in tool making: implements flaked with a clockwise motion (indicating a right- handed toolmaker) can be distinguished frp, those flakea wan a counter- clockwise rotation (indicating a left -handed toolmaker).
Even scratches found on fossil human teeth offer clues. Ancient humans are thought to have cut meat into strips by holding it between their teeth and slicing it with stone knives, as do the present -day Inuit. Occasionally the knives slip and leave scratches on the users' teeth. Scratches made with a left - to - right stroke direction (by right-handers) are more common than scratches in the opposite direction (made by left-handers).
Still other evidence comes from cranial morphology: scientists think that physical differences between the right and left sides of the interior of the skull indicate subtle physical differences between the two sides of the brain. The variation between the hemispheres corresponds to which side of the body is used to perform. specific activities. Such studies, as well as studies of tool use, indicate that right - or left – sided dominance is not exclusive to modem Homo sapiens. Populations of Neanderthals, such as Homo erects and Ho mo habilis, seem to have been predominantly right -handed, as we are.
What is the main idea of the passage？
听力原文： Many changes are taking place in food style. in the U. S. America is traditionally famous for its very solid and unchanging diet of meat and potatoes. Now we have many different alternatives to choose from, various ethnic food, health food and fast food in addition to the traditional home-cooked meal.
Ethnic restaurants and supermarkets are commonplace in the U. S. because the U.S. is a country of immigrants. There is an immense variety. Any large American city is filled with restaurants serving international cooking. Many cities even have ethnic sections: Chinatown, Little Italy or Germantown. With this vast ethnic choice, we can enjoy food from all over the world. This is a pleasant thought for those who come here to travel or to work. They can usually find their native specialties.
Health food gained popularity when people began to think more seriously about their physical well-being. The very term health food is ironic because it implies that there is also unhealth food. Health food is fresh, natural and unprocessed food. It does not contain preservatives to make it last longer or chemical to make it taste or look better. Most health food enthusiasts are vegetarians. They eat no meat. They prefer to get their essential protein from other sources, such as beans, cheese and eggs. Fast food restaurants are now expanding rapidly all over the country. In the U.S. speed is very important. People usually have a short lunch break or they just do not want to waste their time eating. Fast food restaurants are places which take care of hundreds of people in a short time. There is usually very little waiting and the food is always cheap. Some examples are hamburger and pizza places.
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