单选题
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.
【正确答案】
C
【答案解析】
[解析] 由第一段“But dreams come only with sleep. It has been hard to find out more about them”可知本题答案为C。
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