单项选择题

In some countries preschool education in nursery schools or kindergartens ______ the 1st grade.

A．leads
B．precedes
C．forwards
D．advances
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单项选择题
______ both in working life and everyday living to different sets of values, and expectations places a severe strain on the individual.
A．Recreation
B．Transaction
C．Disclosure
D．Exposure
单项选择题
That tragedy distressed me so much that I used to keep indoors and go out only ______ necessity.
A．within reach of
B．for fear of
C．by means of
D．in case of
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