单项选择题

The result of the experiments is reliable and persuasive as all the participants are chosen__________.

A．at random
B．at length
C．to excess
D．on average
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单项选择题
I hope I can __________ myself of the rare chance to gain a deep insight into New Zealand's tradition and culture.
A．assign
B．avail
C．certify
D．pledge
单项选择题
The members of the club voted to __________ the constitution in order to enjoy more privilege.
A．assimilate
B．concede
C．amend
D．confer
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