单项选择题

"Are there living things in space" " ()."

A．We have already got an answer to this question
B．We will never get an answer to this question
C．We got an answer to this question long ago
D．We may get an answer to this question in the next few years

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单项选择题

Radio signals will take () to reach the next star.

A．25 years
B．50 years
C．hundreds of years
D．a few years

单项选择题

People always thought about the question, ()

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"