题型:阅读选择 题类:常考题 难易度:困难
Dreams can happen in any of the four stages of sleep. The most memorable and clearest dreams happen in the last stage of sleep (also known as REM sleep). The sleep cycle repeats about four to five times every night. So you can see how a person has several different dreams in one night. Most people only remember dreams that happen closer to the morning when they are about to wake up. That you can't remember those dreams does not mean they never happened. The stages in the sleep cycle are organized by the changes in different brain activities.
Stage 1: You are entering into light sleep. In this stage, your eyes move rapidly. We call this NREM. The body gets relaxed and your body temperature lowers. Your heart rate lowers, too. The body is preparing to enter into deep sleep.
Stage 2: Also characterized by NREM. In this stage, the body temperature and heart rate drop again. You are completely asleep.
Stage 3: Still in the NREM stage, this is a deeper sleep still.
Stage 4: In this stage of sleep, your eyes move back or forward. We call it REM sleep. This stage happens at about 90-100 minutes after the beginning of sleep. Your blood pressure rises, heart rate speeds up. The majority of your dreams happen in this stage.
These stages repeat themselves throughout a night's sleep.
的建议。
I often fail (失败) to finish the reading test because there is not enough(足够) time. {#blank#}1{#/blank#} I have questions with my English. But I don't like to ask the teacher in front of my classmates. {#blank#}2{#/blank#} I can't follow the tape when I am doing the listening test, because there are always some words I don't know. {#blank#}3{#/blank#} I always forget the new words. Even though I learned them yesterday, I may forget them today when I open the book. {#blank#}4{#/blank#} I am afraid(害怕) to speak English with others, though I know I'm good at it. {#blank#}5{#/blank#} | A. Try to get the main idea of the tape and do not stop to think when you hear the words you don't know. You don't need to know every word in the passage. B. Take short rests and plan your work reasonably(合理地). C. Ask the teacher after class. You can also write the questions down the paper and give it to the teacher. D. Review the words again until you remember(记住) them. E. Do reading exercises in a short time. Try to read fast. You don't need to know each word. F. Listen to others carefully(细心地) and write down what they say. It's a good way to practise your listening skill(技巧). G. Don't worry about that. Try to speak English more with your close friends first. Once you can do it well, talk with the others. |
manage include task able discuss succeed |
What if your pizza was made by a robot? Scientists programme robots with computers. Computer programmes can give robots the {#blank#}1{#/blank#} . It can help them know when and how to perform a {#blank#}2{#/blank#} .
Pizza-making needs several steps. You have to roll the dough(揉面团). You also have to use several tools, {#blank#}3{#/blank#}a rolling pin and a knife. So the robot team had a{#blank#}4{#/blank#} about how to make a robot lift, move and cut dough. They programmed many times, but robots didn't {#blank#}5{#/blank#} to do it. Held, a member of the robot team, says, "The goal is to finally have robots that can help with whatever the task may be." Still, a pizza-making robot is a good goal.
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