单项选择题

The two small independent countries entered into ______ with each other and they felt less afraid of their powerful neighbor.

A．combination
B．alliance
C．cooperation
D．coordination
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单项选择题
______ in several foreign languages is needed for work as a traveler's guide.
A．Competence
B．Efficiency
C．Capacity
D．Proficiency
单项选择题
The most serious block to concentration is the ______ which comes not from outside but from within.
A．intermission
B．involvement
C．interruption
D．intervention
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