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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相关考题

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

-- How often do you go to see your parents-- ______.

A．In no time
B．After a while
C．In a short time
D．From time to time

单项选择题

Tom's score on the English test is the lowest in his class; he ______ have studied very hard.

A．may
B．must
C．should
D．can