单项选择题

During their first teacher-training year, the students often visited local schools for the ______ of lessons.

A．investigation
B．observation
C．inspection
D．examination
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单项选择题
Nowadays, in the labor market, more ______ graduates, who can use the computer, communicate in English and give specialized knowledge, are welcome.
A．sophisticated
B．productive
C．flexible
D．versatile
单项选择题
Psychologists agree that human beings have a strong need to ______ their time; having too much idle time can be as stressful as having none at all.
A．threaten
B．annihilate
C．structure
D．punctuate
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