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Passage 1

All animals must rest, but do they really sleep as we know it The answer to this question seems obvious. If an animal regularly stops its activities and stays quiet and unmoving——if it looks as though it is sleeping——then why not simply assume that it is in fact sleeping But how can observers be sure that an animal is sleeping They can watch the animal and notice whether its eyes are open or closed, whether it is active or lying quietly, and whether it responds to light or sound. These factors are important clues, but they often are not enough. Horses and cows, for example, rarely close their eyes, and fish and snakes cannot close them. Yet this does not necessarily mean that they do not sleep. Have you ever seen a cat dozing with an eye partly open Even humans have occasionally been observed to sleep with one or both eyes par A. need to have a good sleep after they have exhausted themselves by getting rid of hunting animals B. need to have a good sleep after they get tired from hunting other animals C. are all mammals D. almost always have a safe resting place 查看答案 更多"Passage 1 All animals mus"的相关试题: [单项选择] Passage 1 All animals must rest, but do they really sleep as we know it The answer to this question seems obvious. If an animal regularly stops its activities and stays quiet and unmoving——if it looks as though it is sleeping——then why not simply assume that it is in fact sleeping But how can observers be sure that an animal is sleeping They can watch the animal and notice whether its eyes are open or closed, whether it is active or lying quietly, and whether it responds to light or sound. These factors are important clues, but they often are not enough. Horses and cows, for example, rarely close their eyes, and fish and snakes cannot close them. Yet this does not necessarily mean that they do not sleep. Have you ever seen a cat dozing with an eye partly open Even humans have occasionally been observed to sleep with one or both eyes par A. spend some time resting B. close their eyes when sleeping C. are good sleepers D. are poor sleepers 查看答案 [单项选择]All animals must rest, but do they really sleep as we know it The answer to this question seems obvious. If an animal regularly stops its activities and stays quiet and unmoving——if it looks as though it is sleeping——then why not simply assume that it is in fact sleeping But how can observers be sure that an animal is sleeping They can watch the animal and notice whether its eyes are open or closed, whether it is active or lying quietly, and whether it responds to light or sound. These factors are important clues, but they often are not enough. Horses and cows, for example, rarely close their eyes, and fish and snakes cannot close them. Yet this does not necessarily mean that they do not sleep. Have you ever seen a cat dozing with an eye partly open Even humans have occasionally been observed to sleep with one or both eyes partially open. Animals do not necessarily lie down to sleep either. Elephants, for example, often sleep standing up, with their tusks resting in the fork of a A. spend some time resting B. close their eyes when sleeping C. are good sleepers D. are poor sleepers 查看答案 我来回答: 提交 最新试题 ●    中暑患者可能出现：（） ●    [单选题]某发明专利，申请日为2008年8月1日，优先权日为2007年9月1日，公布日为2009年1 ●    [单选题]学生票可在寒假（ ）期间发售 ●    [判断题]低温雨雪冰冻灾害主要存在覆盖面积大、附着力强、环境温度低、持续时间长、危害程度大、极易阻断 ●    [单选题]互换装配法的实质就是控制零件的()来保证装配精度。 ●    [判断题]( )完全互换装配法,是指在同类零件中,任取一个装配零件,不经任何修配即可装入部件中,并能达到规定的装配要求。 网站地图 我要搜题网  版权所有  ©2023  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码