单项选择题

We shall probably never be able to __________ the exact nature of these sub-atomic particles.

A．assert
B．impart
C．ascertain
D．notify
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单项选择题
The financial problem of this company is further __________ by the rise in interest rates.
A．increased
B．strengthened
C．reinforced
D．aggravated
单项选择题
The medicine __________ his pain but did not cure his illness.
A．activated
B．alleviated
C．medicated
D．deteriorated
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