单项选择题

The factor that is likely to make husband or wife in iii health is ______.

A．positive interaction with relatives
B．appropriate physical exercise
C．few social networks
D．healthy food
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单项选择题
To work out a person's mental ratio, one must ______.
A．know his date of birth
B．give him a test
C．find out his mental age
D．know the relationship between his mental age with his chronological age
单项选择题
The expression a variety of tests (Line 1, Para. 3) means ______.
A．a large number of different tests
B．a large number of easy tests
C．a large number of similar tests
D．a large number of difficult tests
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