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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单项选择题
In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden se
A． permanentlyB. imperceptiblyC. irregularlyD. precariously
单项选择题
A careful ______ of the house revealed no clues.
A．dissemination
B．pursuit
C．ornamentation
D．examination
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