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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Consider the universal cannibalism of the sea, all of whose creatures ______ one another.
A．hide from
B．ferret out
C．prey on
D．compete against
单项选择题
To ensure the development and exploitation of a new technology, there must be a constant ______ of several nevertheless distinct activities.
A．interplay
B．implementation
C．improvement
D．exploration
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