单项选择题

Once the ______ contradiction is grasped, all problems will be readily solved.

A．principle
B．principal
C．potential
D．primitive
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单项选择题
If you want to go to the concert, you'll have to make a ______ , or there will be no tickets.
A．reservation
B．punctuality
C．compliment
D．clarity
单项选择题
The travel agency has a full program of ______ , if tourists wish to visit local places of interest.
A．expeditions
B．excursions
C．explorations
D．propositions
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