单项选择题

A friend may be （）, casual, situational or deep and lasting.

A. identical
B. original
C. superficial
D. critical

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单项选择题
Many theories for predicting the relationship between cause and effect ______.
A. testify their complete conformity with general scientific principles
B. justify the identity of dependent, independent, and intervening variables
C. specify the time periods of bodily cycles in terms of psychological tests
D. verify their prediction by variables inconsistent with conventions of science
单项选择题
Those who are on the higher social ladder would feel more peaceful and secure if they could ______.
A. get higher salary and more self-respect
B. have more chance to be further promoted
C. prove better than their fellow-competitors
D. keep far away from this competitive world
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