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
The issue of where the peace talks will be held may seem______, but to the participants it is very important.
A．trivial
B．miniature
C．minimum
D．minimal
单项选择题
His youth was more enjoyable in ______than it had actually been when he was going through it.
A．retrospect
B．retention
C．return
D．reverse
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