九年級(jí)英語全冊(cè) unit 1 how can we become good learners section b（1a-2e）課后作業(yè)課件 新人教版(文件)
【正文】 to experts, sleep is like money. If you sleep only five hours a day, you don’t “get used to it”, but instead, build up a “sleep deficit (虧損 )”. “It’s like a credit card (a card used to buy things or services), ” says Dr. James Maas.“You are only borrowing time. You always have to pay it back.” The more hours you don’t sleep, the more hours you should sleep to “pay back” the hours on your “sleep credit card”. For example, if you sleep four hours on Monday and then sleep eight hours on Tuesday, on Wednesday you will still have a “sleep deficit” of four hours. This deficit can continue for months or even years. People with a “sleep deficit” are sleepdeprived. Driving and making decisions can be dangerous for these people. Another research shows people should sleep nine or ten hours every night. More than half the people in the world may be running a “sleep deficit”. You didn’t do your homework last night? Maybe you can tell your teacher that you were working hard on your sleep deficit. “Don’t think you will be doing less work because you sleep during the day. That’s a foolish idea which is held by people who have no imagination. You will be able to do more, ” said Winston Churchill. ( )1. How many hours do we need to sleep every day if we want to ke
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