35. A. in B. on C. not D. out
Chọn đáp án dựa vào đoạn văn sau
Sleep is very important to human beings. The average person appends 220,000 hours of a
life time sleeping. Until about 30 years ago, no one knew much about sleep, although doctors
and scientists have done research in sleep laboratories. They have learnt a great deal by
studying people as they are sleeping, but there is still much that they don’t understand.
Sleeping is a biological need, but your brain never really sleep. It is never actually blank. The
things that were on your mind during the day are still there at night. They appear as dreams
which people have discussed for years. Sometimes people believed that dreams had magical
powers ort hat they could tell the future! You may have sweet dreams or night-mares
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