题目内容
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Why does Malaysia export rubber to other countries？
A．Malaysia is rich in this natural resource.
B．Malaysia wants to show friendship to other countries.
C．Malaysia does not need rubber anymore.
D．Malaysia intends to win fame in the world.
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Why does the man recommend rowing？
A.It requires few professional skills．
B.It exercises many parts of the body．
C.It is a new item of fitness programs．
D.It is popular with most club members．
Why does the man go to see his professor？
A．To discuss the grade he received on a recent exam.
B．To find out what the final project for the class will be like.
C．To get help finding a businessperson to interview.
D．To ask for resources about conducting an interview.
Why does the author mention water circulation and water budget in paragraph 6？
A．To give examples of open systems that behave as closed systems
B．To illustrate the point that open systems are part of larger systems
C．To emphasize the importance of water in the Earth system
D．To introduce a discussion of threats to the Earth's energy supply
A．12%.
B．20%.
C．30%.
D．13%.
听力原文： RED TIDES
Different events can change the balance of sea life./Red fides are an example./These can happen in oceans, rivers or lakes, anywhere in the world./What happens is that algae suddenly increase in numbers./ Algae are sit. e-celled organisms./They are a normal part of sea life./
As they spread, or bloom, the water may turn red or brown./Sometimes the water does not change color at all./But deadly algae could still be present./
Some kinds of algae produce a strong poison./This can build up in shellfish that eat the algae/and make them poisonous, but not kill them./Other kinds of algae may kill sea life by reducing oxygen levels in the water./ In some red fides, thonsands of dead fish appear on beaches./
Scientists do not know exactly why red tides happen./But they say a combination of conditions all play apart./These include water temperature, nutrients in the water and water flow./Pollution could also play a part/
(1)
Why did Danielle fax Melissa？
A．To sign up his son for the event
B．To share her volunteer experience
C．To offer to help
D．To express gratitude
What does "to make an impression" (Paragraph 1) probably mean？
A．To remember things.
B．To express ideas.
C．To be liked by others.
D．To show respect.
According to the passage, why do consumers shop outside of Snell Grove？
A．Items are less expensive.
B．Snell Grove's commercial area is overcrowded.
C．Mari City is more conveniently located.
D．Snell Grove's shopping district is underdeveloped.
The oldest kind of computer is the abacus, used in China since the sixth century. In the seventeenth century an adding machine was invented, but the first large, modern computer was built in 1973. A few years later a computer could do 5,000 additions per second. Now the computations are so fast that they are measured in nanoseconds.
Today most computers are stored-program computers, that is, they have a memory. They are getting smaller and smaller, and computing faster and faster. Even in a large computer, the part that does the actual computing is about the size of the end of a finger.
Computers can do all kinds of work. When someone buys something in a department store, in formation about the sale goes into a computer. A scientist can talk to the computer about the rocks, and the computer answers the questions. A doctor can talk to the computer and explains what is wrong with a patient. If the doctor asks why, the computer goes through its stored information and ex plains exactly why.
When early humans began fanning, it was a revolutionary change in human life. It was hundreds of thousands of years later that people developed a writing system. In less than fifty years people have developed computers that can do most of the things humans can do. This could be a frightening development.
The oldest kind of computer, the abacus, has been used since ______.
A．600
B．700
C．800
D．500
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