Question

11．Almost all animals need to sleep to stay healthy．But sleeping can also be dangerous because other animals may hurt those who are sleeping．This leads to many different ways of sleeping that help them stay safe．Some of these ways may surprise you!
     Almost all bats sleep upside down．They hang from a branch of a tree or the ceiling of a cave．Up high，bats are safe from most other animals．If they are in danger，they just fly away．
     A dolphin sleeps with just half its brain at a time．It must stay awake to breathe and to watch for danger．Dolphin mothers and babies can go without sleep for as long as two months to stay safe．
     Some ducks sleep with just half their brains，too．These ducks often sleep in a line．The ducks at both ends help to keep the group safe．They keep one eye open to watch for danger．The ducks in the middle sleep deeply with both eyes closed．
     Seals breathe air，but that doesn't stop some of them from sleeping underwater．They hold their breath and dive deep to sleep for up to twenty minutes at a time．Sleeping deep underwater helps these seals stay safe from animals that hurt them near the surface．
     Horses often sleep standing up．Their legs lock in please so they don't fall over．If a horse is lying down，it needs a long time to get up．A horse can run from danger more quickly if it is already standing．
      A flamingo can sleep while standing on one leg．The standing leg locks so it stays straight．The other leg remains close to the flamingo's body．Its head rests on its back．A flamingo lives （and sleeps）near many other birds to stay safe．
     Some seabirds can sleep while they fly．These large birds spend most of their lives over the ocean．They are in danger on the water，but they are safe in the air．They fly for many hours without flapping（拍打）their wings．Sometimes they sleep while they are flying．
 38．The animals that sleep with half their brains areB
A．ducks and seals           
B．dolphins and ducks
C．bats and dolphins          
D．flamingos and seabirds
39．Horses often stand up when they sleep becauseA
A．they can run from danger quickly    
B．they are afraid of falling over
C．this helps them to sleep deeply      
D．it takes them a long time to go to sleep
40．The underlined word"hunt"in Paragraph 5 probably meansD
A．offer to help  
B．come to teach  
C．refuse to protect   
D．want to kill
41．Which of the following can be the best title for the passage？A
A．How animals sleep         
B．Sleep to stay healthy
C．Sleep an animals do        
D．What sleeping animals are like．

Answer 1

分析 短文讲了动物需要睡眠来保持健康，但睡眠可能是危险的，因为其它动物可能会伤害那些正在睡觉的动物，短文详细的介绍了一些动物的睡眠方式，通过这个方式来保护自己的安全．

解答 答案：38．B  细节理解题．根据第三段第一句A dolphin sleeps with just half its brain at a time．海豚一次只用半个大脑睡觉．和第四段第一句Some ducks sleep with just half their brains，too．一些鸭子也只有一半的大脑睡眠．可知海豚和鸭子只用一半的大脑睡觉．故选B．
39．A 细节理解题．根据第六段句子A horse can run from danger more quickly if it is already standing．马站立睡眠是为了能更快的逃离危险，可知马站立睡眠是为了能更快的逃离危险，故选A．
40．D 词义猜测题．根据上下文Sleeping deep underwater helps these seals stay safe from animals that hunt them near the surface．睡在深水下能帮助海豹保持安全远离那些在水面…的动物．可知结合选项，应说睡在深水下能帮助海豹保持安全远离那些在水面捕猎的动物．所以hunt意为捕猎，故选D．
41．A  主旨归纳题．根据整篇文章内容及其第一段句子Almost all animals need to sleep to stay healthy．But sleeping can also be dangerous because other animals may hurt those who are sleeping．This leads to many different ways of sleeping that help them stay safe．Some of these ways may surprise you!几乎所有的动物都需要睡眠来保持健康，但睡眠也可能是危险的，因为其它动物可能会伤害那些正在睡觉的动物，这会导致许多不同的睡眠方式，帮助它们保持安全！可知文章主要说的是动物如何睡觉．故选A．

点评 在通读全文的基础上，根据全文大意，展开逻辑思维，瞻前顾后，认真观察选项，仔细推敲，确定最佳答案．