1. (2021高一上·九台开学考) 完形填空

A strange thing happens to nearly everybody at night. They turn off the lights, pull up the covers and 1 their eyes. Several hours later, they 2 again. Strange, isn't it?

Sleep puzzles science. Scientists and doctors would rather talk about why one can't fall asleep. They are not so sure 3 causes sleep. The best conditions for sleep are good health and meal which is4  too big nor too small. No worries and a comfortable place can help you fall asleep5. They don't think it's good for two people to sleep in one bed. Strange things happen during sleep. For example, you move often. You would feel 6if you didn't. You also dream. Parts of your brain are still 7when you dream. Dreaming happens when the 8and imagination parts of your brain are still awake. In your dream, you can see things that happened 9or people you met before and you might even see things that never happen or people you never meet in your real life. Many scientists say 10 have shown that most of us dream in colour. Bad dreams may be caused by a stomachache. Don't worry if you dream. Some great stories and poems were begun while the writers slept.