B. At last the wrench went broken

　　C. The lock came open after all his efforts

　　D. The chance was lost at the last minute

　　10. It may be inferred from the passage that _______.

　　A. the ditch was along a quiet country road

　　B. the accident happened on a clear warm day

　　C. the police helped Mr. Johnson get out of the ditch

　　D. Mr. Johnson had a tender wife and was well attended

　　B

　　Going to sleep may seem pretty boring compared with all the fun things there are to do while you're awake. But there's a lot going on in your mind and body while you're tucked under those covers.

　　Sleep, in fact, is as important to your survival as eating and drinking. Sleep improves your mood, makes you a better athlete, and helps you remember and understand what you learned during the day. During sleep your temperature drops. Your heart rate slows. Down goes the pressure of the blood moving through your veins. A chemical that controls growth (called a hormone) surges（汹涌） into your bloodstream. Scientists think sleep restores energy and improves your immune () system. We know what happens while we're asleep because scientists study volunteers who sleep in laboratories. The sleepers are hooked up（） to machines that measure brain waves, eye movements and muscle activities.

　　Sleep is like a school day: it's divided into different periods, or stages. When you're awake, your brain waves fire rapidly. As you begin to relax and drift into the first stage of sleep, your brain produces slower-moving waves and you lose awareness of your surroundings. As you slide to deeper sleep, your body repairs itself from the normal wear and tear of daily life. Then, as you begin to drift back up to a lighter sleep, your mind becomes more alert (机警), and your dreams begin. You're in REM sleep.

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