A further study by scientists at the Medical University at Lubeck Germany showed that memories are laid down in two stages during the night. The first is during the deep, so-called “slow wave” sleep, which usually takes place in the first half of the night. The second, and less important stage happens during the period of dreaming or “rapid eye movement (REM)”. When people don’t sleep well in the first half of the night, their memory consolidation is almost the same as having no sleep at all.

　　68.Which of the following statements is correct according to Paragraph 1?

　　A. It is necessary to burn the midnight oil before an exam or interview.

　　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.

　　69. It can be inferred from Paragraph 4 that _____.

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

　　B. professor Stickgold is doubtful about whether sleep can make memories better

　　C. some memories normally influence the function of the brain

　　D. sleep improves the condition of memories

　　70. 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

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