单项选择题

Why has it been difficult for people to find out more about dreams

A．Different people have different ideas about dreams.
B．Different dreams have different meanings.
C．People can only have their dreams studied when they are sleeping.
D．People only have dreams when they are sick.
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单项选择题
What is said about symbols in the text
A．Symbols are meaningful words that are difficult to understand.
B．Symbols are a direct way of telling what really happened.
C．Symbols stand for firings that have just happened.
D．Symbols are the language of the inner mind.
单项选择题
The phrase tune out probably means ______.
A．"ignore"
B．"forget"
C．"stress"
D．"notice"
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