单项选择题

21（）

A．in
B．down
C．along
D．through

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单项选择题

State-owned televisions accept ads in the following countries except （）

A．Portugal
B．Sweden
C．France
D．Italy

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"