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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. Scientists also have sent
A. longer and larger
B. longer and nearer
C. smaller and farther
D. smaller and nearer

[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"

[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. Scientists also have sent
A. 25 years
B. 50 years
C. hundreds of years
D. a few years

[单项选择]You can see the stars on a clear night, but in the daytime they are ______.
A. unavoidable
B. invisible
C. inaccessible
D. unavailable

[单项选择]From here, you can see the bridge （　） construction.
A. in
B. on
C. under
D. with

[单项选择]As you can see, the number of electronic eyes on our roads ______ rising these days.
A. was keeping
B. keep
C. keeps
D. were keeping

[单项选择]Part of the lake has been polluted. You can see the water is covered with ______ oil.
A. a coat of
B. a story of
C. a film of
D. a pad of