单项选择题

It's an ______ thing to climb rocks in such a season.

A．excitement
B．exciting
C．excited
D．excitedly
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单项选择题
If you want to take the exam,you have to start ______.
A．at least
B．on the way
C．right away
D．by the way
单项选择题
The boy is learning _____ at Cambridge University.
A．economy
B．economic
C．economist
D．economies
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