单项选择题

Although economists have traditionally considered the district to be solely an agricultural one, the ______ of the inhabitants' occupations makes such a classification obsolete.

A．productivity
B．diversity
C．predictability
D．stability
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单项选择题
Compared mathematically to smoking and driving, almost everything else seems relatively risk-free, ______ almost nothing seems worth regulation.
A．yet
B．since
C．so
D．even though
单项选择题
Kagan maintains that an infant's reactions to its first stressful experiences are part of a natural process of development, not harbingers of childhood unhappiness or ______ signs of adolescent anxiety.
A．prophetic
B．normal
C．monotonous
D．virtual
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