单项选择题

What did most European scholars believe before 17th century about-the size of the universe

A．That it can't be measured.
B．That it doesn't change.
C．That it's getting smaller.
D．That it's rapidly increasin
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单项选择题
What was NASA accused of on Wednesday
A．Being too prudent and cautious.
B．Being too hasty to assure safety.
C．Causing the Columbia tragedy.
D．Delaying launch plans.
单项选择题
What did some scientists try to explain by suggesting that stars repel each other
A．Why stars move so quickly.
B．Why few stars have planets.
C．Why stars aren't moving toward one another.
D．Why stars haven't moved farther apart.
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