单项选择题It comes as no surprise that societies have codes of behavior. The character of the codes, on the other hand ,can often be ______.
A．predictable
B．unexpected
C．explicit
D．confusing
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1.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
2.单项选择题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
3.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
4.单项选择题A careful ______ of the house revealed no clues.
A．dissemination
B．pursuit
C．ornamentation
D．examination
5.单项选择题For some time now, ______ has been presumed not to exist: the cynical conviction that everybody has an angle is considered wisdom.
A．rationality
B．flexibility
C．disinterestedness
D．insincerity
6.单项选择题An investigation that is ______ can occasionally yield new facts, even notable ones, but typically the appearance of such facts is the result of a search in a definite direction.
A．timely
B．unguided
C．consistent
D．subjective
7.单项选择题According to legend, Daniel Webster made a ______ with Satan, but managed to talk his way out of it at the last moment.
A．economy
B．standard
C．van
D．compact
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