How Do Animals Catch their ZZZ's（打鼾声）？Different creatures have developed some pretty creat

How Do Animals Catch their ZZZ's（打鼾声）？
Different creatures have developed some pretty creative ways to get their rest and stay safe． The lizard likes to sleep at the far end of small branches hanging out over a pond or lake in the rain forest． If a snake tries to slither up the branch to eat it, it will shake the branch and knock the lizard off, and the lizard will fall safely into the water． Chameleons can change color to match their surroundings in order to hide even while sleeping．
Gorillas like to sleep high in the trees． They build a new bed every night, sometimes taking up to half an hour to pile branches, twigs, and leaves into a comfortable bed． Birds also find it safe to sleep in the trees, but unless they have eggs or young chicks, they don't use a nest． They just lock their feet around a branch and hang on． A special tendon in their legs is automatically tight when they are at rest, so they won't let go and fall．
Dolphins live underwater, but must come to the surface to breathe． Scientists now believe that dolphins may sleep with only half their brain, while the other half stays awake to keep them safe and breathing． Seals also do this, lying on their sides on the surface of the water with one flipper underwater paddling to keep their noses above the surface． Some ducks may also have this ability, and actually sleep with one eye closed and one eye open．
【小题1】How does a chameleon protect itself while sleeping?A．By changing its body colorsB．By hanging out over a pond．C．By sleeping with half their brain．D．By making beds with branches．【小题2】Why will not birds fall when they are at rest?A．They build nests and sleep in them．B．They fall asleep automatically．C．They have a loose tendon in their legs．D．They lock their feet around a branch．【小题3】How do dolphins breathe?A．They breathe underwater．B．They come to the surface to breathe．C．They breathe underwater or come to the surface to breathe．D．We don't know．【小题4】What does the writer intend to tell us?A．The cleverest animal is the gorilla because it can make beds．B．Differences in habitat can lead to different living habits．C．The ways animals catch their ZZZ's are pretty much the same．D．In order to protect themselves most animals choose not to sleepA

(答案→)A 解析：本文主要讲述的是动物在水面的时候如何保护自己，不同的动物有不同的习惯。【小题1】A 细节题。根据第二段最后一句Chameleons can change color to match their surroundings in order to hide even while sleeping．说明Chameleons是通过改变身体的颜色来保护自己的，故A正确。【小题2】D 细节题。根据第三段第4,5行They just lock their feet around a branch and hang on．说明他们的脚是紧紧扣住树枝。故D正确。【小题3】B 细节题。根据文章第四段第一行Dolphins live underwater, but must come to the surface to breathe．说明海豚是要到水面上呼吸空气的，故B正确。【小题4】B 主旨大意题。本文中提及了很多不同的动物在睡眠的时候采取不同的方式来保护自己。说明不同的生物有不同的生活习惯。故B正确。

收益了