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"

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单项选择题

The speed of radio signals is ()a spaceship.

A．a little greater than
B．as great as
C．much greater than
D．less than

单项选择题

What does this passage mainly talk about()

A．TV can make advertisers aware of their products.
B．TV is more popular than any other medium in the United States.
C．TV covers a large audience at the same time.
D．TV carries more national advertising than other media in the United States.