. Researchers don't know why people or any other animals do it.One thing REM-sleeping animals have in common....The fact that all animals make time for sleeping, even under potentially dangerous circumstances ……

(最小的) amount of sleep is essential, even in short-sleeping animals, according to German scientist... perform a lot of maintenance (维护), for example, repairing tissue (组织) and growing muscle. Sleeping ……

is aware of things going on around the animal.This is known as unihemispheric sleeping. Animals like...睁一只眼，闭一只眼睡觉的鳄鱼。词数 270 建议阅读时间 6分钟课件及教案见网站 测试见7版ANIMALS don’t have alarm clocks (闹钟) like humans, so ……

one of the longest-sleeping animals in the world. How many hours do you sleep every day? Maybe 10...-hum ... Sorry kids, I’m sleepy. I am one of the longest-sleeping animals in the world. How many ……

of sleep.B. The importance of sleep.C. Two types of sleep.D. Animals’ different sleeping habits.2. All...-sleeping animalsC. it’s believed that REM sleep can promote animals’ intelligenceD. some animals sleep ……

one of the longest-sleeping animals in the world. How many hours do you sleep every day? Maybe 10... ... Sorry kids, I’m sleepy. I am one of the longest-sleeping animals in the world. How many hours ……

. It means that animals sleeping in winter are awakened (醒来) by spring thunder and that the earth begins... time for fishingAround jingzhe, sleeping animals wake up, and so do fish. They swim from ……

when sleeping animals wake up and people start farming (农耕). The weather around this day differs... of Insects is in spring when sleeping animals wake up and people start farming (农耕). The weather ……

DO animals dream? It looks like they do. If you’ve ever watched your dog or cat sleeping, you’ve... seem to spend most of their sleeping time dreaming about hunting (猎食). Almost all warm-blooded animals ……

refreshed. But have you ever wondered what sleep is like for animals?In fact, from sleeping standing up to shutting down half of their brain, animals have some surprising yet fun sleeping habits ……

DO animals dream? It looks like they do. If you’ve ever watched your dog or cat when it sleeps, you... many animals like goats, cats, dogs, mice, and monkeys when they sleep. Scientists have found out ……

that the animals’ sleeping postures (姿势) had something to do with their body size and weight. Small animals...动物为什么有各种各样的睡姿？ How do you sleep? Most people sleep on their backs or sides. Do animals sleep ……

Brains are more active sleeping than watching TV. ……

of their time sleeping at night. B. They like to stay in shallow bays during the day.C. They keep half of their brain awake while sleeping.D. They may be sleeping even when they’re swimming. 2. When dolphins ……

while standing.Because they don’t have to use any energy, sleeping while upright is no problem for horses. In fact, it is preferable to lying down. Horses are heavy animals with big muscles (肌肉 ……