5 Why can’t people tell whether other animals are sleeping or not by mere observation?
(A)Other animals sleep in different ways from human beings.
(B)Compared with other animals, human beings are good sleepers.
(C)Most other animals do not close their eyes when they are asleep.
(D)Compared with other animals, human beings are poor sleepers.

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統計： A(109), B(23), C(41), D(8), E(0) #1188233

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(A) All animals must rest, but do other animals sleep as human beings do? Observations of animal behavior alone cannot fully answer the question.

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