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 local people were joyfully surprised to find the price of vegetables no longer ______ according to the weather.
A．altered
B．converted
C．fluctuated
D．vibrated
单项选择题
All the people hold that this talented university student recruited by IBM is on the ______ of a brilliant career.
A．corridor
B．threshold
C．edge
D．entrance
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