Jerry Siegel, professor at the Center for Sleep Research at the University of Calfornia, Los Angeles, said going without sleep hurts performance, but he's not convinced that sleep itself actively contributes to learning.

　　"If you take a break for a few hours, it can easily be shown that learning did occur, because performance is better at the start of a new learning session than it was at the end of the initial session," he said. "No sleep needs to occur for this to happen."

　　Still, Siegel suggested that sleep before learning a skill is crucial. "For long-term retention, it is more important to be well rested and therefore attentive when you are doing the learning than afterwards," he said. "It is even better if you don't have to choose and get your natural amounts of sleep every day."

　　49 What does the underlined word ‘want’ (in Paragraph 1) mean?

　　A. lack

　　B. wish

　　C. desire

　　D. need

　　50 What is mainly talked about in this text?

　　A. The effect of video games on learning.

　　B. The relation between sleep and learning.

　　C. The role of dreams in the learning process

　　D. The difference between morning and evening trainings.

　　51 What would be the best title for the text?

　　A. Sleep strengthens learning.

　　B. Dreams clearly help learning.

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