单项选择题

The basic causes are unknown, although certain conditions that may lead to cancer have been_________

A．notified
B．qualified
C．identified
D．satisfied
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Of all the soldiers they had the _________ of being the fiercest, the most patriotic and the toughest.
A．recognition
B．reservation
C．reputation
D．recreation
单项选择题
The police had difficulty in _________ the crowd from rushing onto the football pitch.
A．restraining
B．constraining
C．refraining
D．restricting
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