单项选择题

A．The problem may have been a very complicated one.
B．The man can solve the problem himself.
C．Even Linda can not solve the problem.
D．The woman thinks that the problem is too easy.
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单项选择题
Emotions are significant for man’’s survival and adaptation because ________.
A．they provide the means by which people view the size or shape of objects
B．they are the basis for the social feeling of agreement by which society is maintained
C．they encourage people to perform dangerous achievements
D．they generate more love than hate among people
填空题
A．andB．orC．butD．then
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