16．A strange thing happens to nearly everybody at night．They turn off the lights，put up the covers and close their eyes．Six or seven hours later，they wake up 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 what causes sleep．
The best conditions for sleep，they say，are good health and meal neither too big nor too small．No worries and a comfortable place to sleep in are important，too．They advise against two in one bed．
Strange things happen during sleep．For example，you move often．You would feel tired if you didn't．You also dream．Part of your brain is still awake when you dream．Dreaming happens when the memory and imagination parts of your brain are still awake．Experiments have shown that 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．
28．You would feel tired during sleep if youC．
A．move too often     
B．sleep on your back   
C．didn't move  
D．went to sleep late
29．Dreaming happens whenC．
A．you are in a deep sleep                    
B．y ou are not comfortable
C．part of our brain is still awake              
D．there's too much noise  in the room
30．The best title for this passage isB．
A．Why You Dream                    
B．The Strangeness of Sleep
C．What Happens During Sleep           
D．The Cause of Sleep．

分析 本文主要講人為什么要睡覺(jué)？怎樣才能睡得香呢？睡覺(jué)時(shí)為什么做夢(mèng)呢？做夢(mèng)要緊嗎？

解答 28．C．細(xì)節(jié)理解題．由第3段第3句話You would feel tired if you didn't（move）可知如果在睡眠中你沒(méi)有動(dòng)你會(huì)感覺(jué)疲憊；故選C．
29．C．細(xì)節(jié)理解題．根據(jù)第四段Dreaming happens when the memory and imagination parts of your brain are still awake可知夢(mèng)境總是發(fā)生在你的腦子還有部分清醒的時(shí)候；故選C．
30．B．主旨大意題．根據(jù)文章中的Sleep puzzles science和strange things happen during sleep可知本文主要講了關(guān)于睡覺(jué)的一些內(nèi)容，故答案選B．

點(diǎn)評(píng) 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．

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