单项选择题

Scientists are claiming a major______ in the treatment of cancer and AIDS.

A．distinction
B．breakthrough
C．identification
D．interpretation
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单项选择题
He received $ 5000 in______ for the loss of his right leg in the traffic accident.
A．refund
B．compensation
C．repayment
D．premium
单项选择题
This attitude becomes part of their subculture and is______ from generation to generation.
A．transmitted
B．submitted
C．transformed
D．switched
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