More and more of the world's supply of seafood is coming from farms.

A . they operate between 150 and 450 rpm B . they are connected to the propeller by gearing C . their smaller size and weight D . they can be connected directly to the propeller without gearing

A . was spoken B . is spoken C . spoke D . speak

M: I agree. People like bankcards because they offer greater safety and convenience than personal checks. Q: What can be inferred from the conversation？ (20) A．A merchant doesn't know the balance before completing a sale. B．No security system has yet been devised for personal checks. C．A personal check is secure at the check stand. D．The clerk can examine all the bankcards.

A．rampant B．disorderly C．trendy D．conventional

Sharks do not have bones, and a shark has an extremely good sense of smell. It can find. small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their fond. Some sharks will eat just about anything. Many unusual things have been found in the stomachs of some large sharks. They include shoes, dogs, a cow's foot and metal protective clothing. About forty percent of the different kinds of sharks lay eggs. The others give birth to live young. Some sharks carry their young inside their bodies like humans do. Scientists are beginning to understand the importance of sharks to humans. Medical researchers want to learn more about the shark's body defense system against disease. They know that sharks recover quickly from injuries. Sharks appear never to suffer infections, cancer or heart diseases. What is this passage mainly about？ A．The necessity of protecting sharks. B．The living environment of sharks. C．The dangers of sharks to human beings. D．An introduction to sharks.

More than half of the 1000 holiday-makers interviewed said they had decided to send fewer cards, turning instead to their electronic rivals. A quarter of the respondents (受调查者) regard postcards as old-fashioned and slow to arrive. A further 14% admitted that thinking of something to fill the space was too challenging, compared with a call home. Although officially invented by a Hungarian, Emanuel Herrmann, in 1869, the idea of illustrated cards was taken up with most enthusiasm in Victorian Britain, joining Gothic architecture and landscape gardening as fields for which the country was famous. "If the British postcard did disappear, we would lose forever something of great importance to the nation, "said Chris Mottershead of Thomson Holidays, which did the survey. He was backed by Marie Angelou of Sussex University, who has investigated the importance of sending and receiving postcards. "Postcards are nothing like phone calls, instant messages and direct photo shots via the mobile, "she said. "All these are useful, practical devices, but postcards offer something else, something additional that is not simply functional, but imaginative and personal. They can create the real atmosphere of your holiday in a way that nothing else can do. They are also for more than a moment—with some people adding them to collections built up over years and years. Who first got the idea of illustrated cards？ A．Emanuel Herrmann. B．Victorian Britain. C．Chris Mottershead. D．Marie Angelou.

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A．Cortisol B．testosterone C．pituitary D．cxytocin

2. Yet the implication that rapid change is a new phenomenon is again misleading. If you measure the time it takes for a technology to become widely diffused, today's experience does not seem unusual. Take the car. The basic patent for an internal-combustion engine capable of powering a car was fried in 1877. By the late 1920s—50 years later—over half of all American households owned a car. 3. The comparable dates for the computer axe harder to tie down, but the first big computer, based on vacuum valves, was built in 1946. The transistor—the first semiconductor device—was invented at Bell Laboratories in 1948. The first patent for an integrated circuit was filed in 1959. Now, in 1999-50 years after the first one was built—around half of American households own a computer. The pace of introduction has been similar to that of the car. 4. You have to cheat, choosing only the date for the personal computer, say(mid-1970s), or the internet (ditto) to make it seem much more rapid. Comparing its diffusion among private users is, you might say, unfair to the computer, for that machine's main use is in businesses. On that measure, the best historical analogy is with electrification, and the spread of the electric dynamo into factories. 5. According to Paul David, a historian at Stanford University in California, the first electricity-generating stations had been installed in New York and London in 1881, but it was well into the 1920s before the dynamo became widely used and started to raise productivity. The adoption of the computer in business has also been slow, and failed to have any measurable impact on productivity until very recently.

In ancient Mexico there were many clearings in the forest. In each clearing was a village with fields of different crops around it. The Maya cut down trees with stone axes and planted seeds by digging holes in the ground with pointed sticks. A farmer was able to grow crops that produced food for several people. But not every Maya had to be a farmer. Some were cloth makers, builders, or priests. The Maya believed in many gods. The people built large temples to honor their gods. Skillful workers built cities around these temples. It was difficult to construct these cities, because they had no horses to carry the heavy stone needed. Workers had to carry the building materials themselves. Today, many of these ancient Mayan cities and temples are still standing. Measuring time was important to the Maya, so they developed a system for measuring it accurately. Farmers needed to know when to plant and harvest their crops. Mayan priests made a system to keep track of time. They wrote numbers as dots (...) and bars (- ). A dot was one and a bar was five. The Mayan priests studied planets. They made a calendar from what they learned. The year was divided into. 18 months of 20 days each with five days left over. The Mayan calendar was far more accurate than the European calendars of the time. Around the year 800, the Maya left their villages and beautiful cities, never to return. No one knows why. They may have died from an infectious disease. They may have left because the soil could no longer grow crops. Archaeologists are still trying to find the lost secrets of the Maya. They are still one of our greatest mysteries. This article may be taken from ______. A．a magazine B．a literature book C．an art book D．a historical book

A．With; developing B．Under; development C．With; development D．Under; developing

A．YES B．NO C．NOT GIVEN

Do you want to go to Paris, Washington, Tokyo？ Heaven Air will take you there, at all times of the day or night, right through the week. But Heaven Air flies not only to the biggest cities, we also fly two or three times a week to towns and cities in the very center of Asia, Africa and South America. People fly with Heaven Air because they know they will leave on time and arrive on time, They know that they will receive the best food and watch the best films. Heaven Air is second to none. Heaven Air is the name of______ . A．a plane B．an airline C．a travel service D．an advertising program

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