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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单项选择题
Though many thought him a tedious old man, he had a ______ spirit that delighted his friends.
A．juvenile
B．meek
C．leaden
D．youthful
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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