We can infer from the text that ______.
A.all living things sleep
B.some people can wake up on time without being called
C.old people usually sleep nine or eleven hours a day
D.we are sure that our minds are not going when we are asleep
第7题
A.费希纳;冯特;艾宾浩斯
B.费希纳;艾宾浩斯;冯特
C.冯特;费希纳;艾宾浩斯
D.冯特;艾宾浩斯;费希纳
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