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
The National Industrial Recovery Act was designed to spur industry.（）

A．tax
B．stimulate
C．censure
D．rebuke
单项选择题
The sense of mistrust is compounded by smaller annoyances that leave the families feeling as though no one in authority cares about them.（）

A．offset
B．intensified
C．diminished
D．annulled
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