单项选择题

As one of the youngest professors in the university, Mr. Brown is certainly on the （）of a brilliant career.

A．porch
B．threshold
C．edge
D．course

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单项选择题
Retirement is obviously a very complex （）period; and the earlier you start planning for it, the better.

A．transition
B．transaction
C．transmission
D．transformation
单项选择题
Diamonds have little （）value and, their price depends almost entirely on their scarcity.

A．subtle
B．eternal
C．inherent
D．intrinsic
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