单项选择题

More has been learned about the Moon than any other of the Earth''s neighbors in space because of the Apollo program, which enabled men to walk on the Moon and bring back hundreds of pounds of（）.

A．rocks
B．rock
C．stone
D．stones

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单项选择题

I can''t tell the time because the（）of the clock have been removed.

A．hands
B．pointers
C．arms
D．fingers

单项选择题

If you hear the fire（）, leave the building quickly.

A．warning
B．alarm
C．signal
D．bell

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