单项选择题

NASA had planed to launch its space shuttle ______ in September.

A．Discover
B．Atlanta
C．Columbia
D．Atlantis
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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
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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