单项选择题

The basic causes are unknown, although certain conditions that may lead to cancer have been （）

A．identified
B．guaranteed
C．notified
D．conveyed

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单项选择题
All individuals are required to （）to the laws made by their governments.

A．obey
B．conform
C．concede
D．observe
单项选择题
They have always regarded a man of （）and fairness as a reliable friend.

A．robustness
B．temperament
C．integrity
D．compactness
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