关注我们

移动端
扫描二维码直接进入
投稿
扫描二维码联系
公众号
扫描二维码直接进入
您现在的位置:

longman science 3B 13

人人听英语(原人人听力网)免费英语学习网站
人人听英语公众号

[提示:]双击单词,即可查看词义!

听力原文

[by:喜欢irrting.com,请把irrting.com告诉你QQ上的5位好友,多谢支持!]
[00:00.00]13   WHAT HAPPENS WHEN THINGS ARE HEATED OR COOLED?
[00:03.20]物体受热或受冷时会发生什么变化?
[00:06.40]Will a substance expand when it is headted and contract when it is cooled?
[00:10.03]物体加热时会膨胀,受冷时会收缩吗?
[00:13.66]FINDING OUT
[00:15.29]找出
[00:16.93]1.(a)Will metal rod become longer when it is heated?
[00:20.26]当金属竿受热时会变得较长吗?
[00:23.59](b) Take away the alcohol lamp.What happens to the metal rod?
[00:27.42]拿走酒精灯。金属竿会发生什么变化?
[00:31.24]2.(a)Heat the metal ring only.Can the metal ball go through the ring?Why?
[00:35.66]单独加热金属杯,铁球能穿过金属环吗?为什么?
[00:40.07](b)Cool the metal ring.Can the metal ball go through it now?Why?
[00:44.41]使金属环冷却。现在金属球还能穿过它吗?为什么?
[00:48.74]3.(a)Put the test-tube in hot water,What happens to the coloured water?
[00:53.97]把试管放在热水里。有颜色的水会生什么变化?
[00:59.19](b)Now.put the test-tube in cold water.What happens to the coloured water?
[01:02.92]现在把试管放在冷水中。有颜色的水会发生什么变化?
[01:06.64]4.(a)Put the flask  in hot water.What happens to the air inside the flask?
[01:11.07]把试管放进水里。烧瓶里的空气会发生什么变化?
[01:15.49](b)Now,put the flask in cold water.What happens to the air inside the flask?
[01:19.87]现在把烧瓶放进冷水里,烧瓶里的空气会发生什么变化?
[01:24.24]fixed marking   coloured water    hot water  cold water
[01:28.52]标记            有颜色的水        热水       冷水
[01:32.79]balloon    flask    hot water    cold water
[01:37.16]气球       烧瓶     热水         冷水
[01:41.54]MAIN POINTS
[01:43.16]要点
[01:44.78]When a substance is heated,it expands.When it is cooled,it contracts.
[01:49.35]当物体受热时,它会膨胀,当物体受冷时,它会收缩。
[01:53.92]Under different tempertures,
[01:55.85]在不同的温度下,
[01:57.79]gas shows the biggest changes in volume
[02:00.22]气体体积变化最明显,
[02:02.64]and solid shows the smallest changes in volume.
[02:05.73]固体体积变化最小。
[02:08.81]ACTIVITIES
[02:10.39]活动:
[02:11.97]1.Why are there gaps in roads.flyovers and frilways?
[02:15.76]道路,天桥和铁轨上为什么有空隙?
[02:19.55]road surface        flyover           failway
[02:22.79]路表面              天桥              铁轨
[02:26.02]2.Why are the overhead wires never too loose or too tight?
[02:29.85]为什么头顶上的输电线不太松也不太紧?
[02:33.68]3.Why does the alcohol level in the thermometer rise
[02:36.80]为什么当湿度高时,酒精平面会上升
[02:39.92]when the temperature is high and drop when the temperature is low?
[02:43.20]而当温度低时酒精平面会下降?
[02:46.48]4.This table-tennis ball has a dent.How can you make it round again?
[02:50.57]乒乓球上有个凹陷,你怎样能使它变回原形?
[02:54.65]5.Give some uses of expansion and contraction in our daily lives.
[02:58.43]举一些我们日常生活中热胀冷缩的用处的例子。

责编:Heaven

特别声明:本栏目内容均从网络上收集,供仅参考试用,正式学习请到书店购买正版教材。试用资料有效性和正确性也无法保证。本站并不拥有这些资料的版权,版权属于原版权所有人。

课程推荐 更多课程>>

  • 语法大师——自然拼读 ¥9.9

    主讲老师:Jennifer 查看详情

  • 语法大师——零基础学英语 ¥99

    主讲老师:Jennifer 查看详情

特别声明

本网站对任何由于使用本网站而引起的损失,不承担责任。

本网站上链接的非本站的网页和内容不受本网站的控制,本网站对其内容不负责任。

本网站上挂接的其他单位的网站内容由主办方负责维护,本网站对其内容不负责任。

如果本站部分内容侵犯了您的版权,敬请联系我们。我们将在第一时间删除相关资料并通过本站及其他渠道公开致歉。

本网不保证所有信息、文本、图形、链接及其它项目的绝对准确性和完整性,故仅供参考使用。

Copyright©2019-2020 人人听 www.irrting.com All Rights Reserved. 沪ICP备20004249号 广电制作许可证:(沪)字第03975号

沪公网安备31011702007423号