[单项选择]According to David Wedin, the extinction of many species are caused by human beings' ______.


A. arrogance.
B. ignorance.
C. nonchalance.
D. blunder.

[单项选择]According to David Wedin, the extinction of many species are caused by human beings' ______.


A. arrogance.
B. ignorance.
C. nonchalance.
D. blunder.

[单项选择]Many friends came to David's house ______ dinner in the evening.

[单项选择]Which of the following is David Debut' s idea on the relationship between people and computers


A. Computer learning should be made easier.
B. There should be more computer clubs for experts.
C. People should work harder to master computer use.
D. Computers should be made cheaper so that people can afford them.

[单项选择]Which of the following is David Tebburt's idea on the relationship between people and computers
A. Computer learning should be made easier.
B. There should be more computer clubs for experts.
C. People should work harder to master computer use.
D. Computers should be made cheaper so that people can afford them.

[单项选择]The passage covers David Frost's ______.
A. last thirty years
B. life after 1969
C. life before 1969
D. first 55 years

[单项选择]Many people think that English soccer star David Beckham is( )a pop star( )a player.
A. mainly; than
B. either; or
C. very much; not
D. more of; than

[单项选择]Henry David Thoreau's work, ______ has always been regarded as at masterpiece of New England Transcendentalism.


A. Daisy Miller
B. White Fang
C. Walden
D. The Prince and the Pauper.

[单项选择]Henry David Thoreau's work ______ , has always been regarded as a masterpiece of New England Transcendentalism.
A. Daisy Miller
B. White Fang
C. Walden
D. The Prince and the Pauper

[单项选择]

Passage Five
On a clear night you can see many stars in the sky. These stars are millions of miles away. Are there living things on any of the stars People have always thought about this question. They could not find the answer before now. Today scientists know more about space than ever before. Some machines can help them look for the answer.
How will scientists do this People can’ t go to the stars. The stars are far away. A person would take hundreds of years to the next star in a spaceship. So scientists are sending out radio signals. These signals travel in space at the speed of light. At that speed, radio signals will take 25 years to reach the next star. The signals ask "Is there anyone out here". Living things in space must have machines to hear the signals. We will not get an answer to our signals for more than 50 years. However, scientists are already listening. Someone from space may be trying to send signals to us, too.
S
A. "How can scientists use machines to look for a star"
B. "How far away are the stars"
C. "How many years a person would take to go to the next star in a spaceship"
D. "Is there life in space"