单项选择题

Many stockholders got very nervous when the price went down and sold their stocks at once, while ______ investors held their stock until prices rose again.(2006年中国矿业大学考博试题)

A．shabby
B．restless
C．shrewd
D．naive
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单项选择题
After the death of the father, the oldest son______ the burdens of the family.
A．carried
B．shouldered
C．received
D．held
单项选择题
Scientists are working hard to come up with a sure solution to the food______ for mankind.
A．decline
B．rarity
C．scarcity
D．shortage
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