单项选择题

He was usually very kind so that his sudden _________ greatly surprised us.

A．shrewdness
B．optimism
C．harshness
D．uprightness
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单项选择题
Because Bob had stopped reading his technical journals he was _________ of new development in his field.
A．intellectual
B．subtle
C．ignorant
D．tentative
单项选择题
When he lost his job he tried to _________ his fortunes by robbing a bank.
A．revive
B．retrieve
C．rectify
D．recycle
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