B. Sleep speeds up the loss of memory.

　　C. Man should have a good sleep if he wants to keep a good memory.

　　D. Staying up late will make you better prepared for an exam or interview.

　　2. It can be inferred from the fourth paragraph that________.

　　A. some process helps memories to be washed out of the brain

　　B. Professor Stickgold is doubtful about whether sleep can make memories worse

　　C. some memories normally influence the function of the brain

　　D. sleep may can improve the condition of memories

　　3. How was the research conducted by Professor Stickgold?

　　A. The subjects were divided into two groups.

　　B. All the subjects were kept awake for 3 nights.

　　C. One group slept at the first night but was kept awake the next two nights.

　　D. One group was kept awake for 3 nights but the other slept for the second and third nights.

　　4. What was the study result of the scientists' at the Medical University at Lubeck?

　　A. REM sleep is not important at all for the consolidation for memory.

　　B. Intellectual performance mainly depends on the slow wave sleep period.

　　C. When people sleep poorly in the first half of the night, it is almost the same as having no sleep at all.

　　D. REM sleep is as important as slow wave sleep in terms of memory recall.

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