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Scientists around the world are racing to learn how to rapidly diagnose, treat and stop th
A.detected
B.caught
C.disclosed
D.revealed
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A.detected
B.caught
C.disclosed
D.revealed
SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文: The Internet dates back to 1969, when the U.S. Department of Defense decided to build an experimental network to make sure computer-based command in the event of a nuclear attack. As time went by, public and commercial networks in North America and Europe joined the system, and the expanding giant was born.
Until ten years ago, the Internet was actually the private fields of scientists and university students. During recent years, curious private citizens and businesses are crowding onto the Internet at a speed that is doubling its size every year.
Now, computer networks have spread to form. a giant global Web. Some 100 million people from over 140 countries around the world have logged on to the Internet, a system linking tens of thousands of networks filled with information, discussion and entertainment. Millions of Web pages contained in a great number of sites are commonly used to exhibit a mixture of text, graphics, sounds and video clips, as well as links to other Web pages.
On a typical day, data, as much as several million 250-page books, will pour through the Internet. Stored in the system are huge amounts of scholarly and scientific data, government documents and public records, airline timetables, weather reports, the full text of the Bible, and thousands of newspapers and magazines from around the world.
In addition, by creating communities of people sharing common interests, computer networks are making their influence felt in schools, in the business world, in politics and government.
Who first created the networks that later developed into the Internet?
A.Some scientists and university students.
B.Big businesses.
C.The U.S. Department of Defense.
D.The U.S. government together with several European governments.
When did the scientists start working on a successor to the shuttle?
A.Immediately after the Columbia disaster.
B.One year after the Columbia disaster.
C.Years before the explosion of Columbia.
D.Not mentioned in the passage.
It can be inferred from the text that______.
A.discoveries of new planets set scientists thinking
B.extrasolar planets exist in the universe
C.solar system should be re-examined by mankind
D.new discovery depends on new theory
How did scientists determine the age of the universe?
A.By observing the oldest stars in the universe.
B.By studying the nearest stars that can be seen.
C.By fixing the age of the oldest stars in the Galaxy.
What do scientists think causes dreams?
A.Sleep.
B.Scientists have not found the reason up to now.
C.REM sleep.
D.It is not mentioned in the article, but scientists have known it.
A.Were there
B.If there are
C.If there have been
Very few scientists ______ with completely new answers to the world's problems.
A.come to
B.come around
C.come up
D.come in
On the basis of their models, scientists are of the opinion that______.
A.the climate of the world should be becoming Cooler
B.the new Ice Age will be postponed by the greenhouse effect
C.the warming effect helps to increase the solar effects
D.inertia of the earth's climate to take effect in thousands of years
There are more than 200 scientists in the institute,______(其中只有三人) are working to try to determine how a person feel the world around him.
On the basis of their models, scientists are of the opinion that______.
A.the climate of the world should be becoming cooler
B.it will take thousands of years for the inertia of the earth's climate to take effect
C.the man-made warming effect helps to increase the solar effect
D.the new Ice Age will be delayed by the greenhouse effect
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