单项选择题

A. Husband and wife.
B. Shop assistant and customer.
C. Boss and secretary.
D. Father and daughter.
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单项选择题
How much stress we should have so as to help us work better
A. At a level which is healthy for a particular individual.
B. Full of stress at work.
C. The more, the better.
D. The less, the better.
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