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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单项选择题
What will the students read about for homework
A．Newton's life and times.
B．The influence of earlier scientists on Newton's ideas.
C．How gravity repels objects very close to each other.
D．How the current theory resolved contradictions in earlier ones.
单项选择题
According to Henry Moore, why is sculpture more difficult to appreciate than other forms of art
A．It is often displayed outdoors.
B．It does not always represent an object.
C．It is three dimensional.
D．It is done by relatively few artists.
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