单项选择题

Both a person's heredity and his environment help to shape his character.

A．relative
B．education
C．nationality
D．surroundings
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单项选择题
She was so obstinate that she wouldn't adjust her opinions.
A．inflexible
B．alert
C．wise
D．talented
单项选择题
Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.
A．are caused by
B．explain
C．derive from
D．constitute
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