Rockets in the Sky
If someone asked you, What color is the sky? I expect that you would answer, Blue. I am afraid that you would be wrong. The sky has no color. When we see blue, we are looking at blue sunlight. The sunlight is shining on little bits of dust in the air.
What is the sky? The sky is space. In this space there is nothing except the sun, the moon and all the stars.
The moon is about 384,000 kilometers away from the earth. An airplane cannot fly to the moon but there is a thing that can fly even when there is no air. This is rocket.
This is how a rocket works. It is not made of rubber like a balloon, of course. It is made of metal. The metal must not be heavy but it must be very strong. There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket, the rocket is pushed up into the air.
练习:
A) It is blue.
C) It is grey.
2. When an airplane flies too high,
B) the air will become thicker.
D) the air will disappear in no time.
A) it looks like a balloon.
C) it doesnt have wings.
4. Which of the following statements about a rocket is NOT true?
B) It can fly without wings.
D) It is propelled by burning gas inside it.
A) hot gas rushes out of its head.
C) hot gas rushes out of its bottom.
Keys: DADDC
90后中国男生加拿大狮口救人
尤塞恩•博尔特:打破三项世界纪录的“牙买加飞人”
为什么面试失败的总是你
贾斯汀比伯与Lady Gaga粉丝微博大混战
美媒称中国教师薪水几乎垫底 课外收入宇宙第一
最受吃货欢迎的研究:常吃巧克力会变瘦
泰坦尼克号沉没新说 或因海市蜃楼
十二月的玫瑰
法总统萨科奇为保持身材逐奶酪出宫
美媒评职业排名:IT民工领先 媒体从业者垫底
美军研发“读心术” 五年内打造心感军团
马琳无缘奥运泪洒庆功会 刘国梁称赞老将大局为重
网络书榜造假是潜规则
爱因斯坦十大名言
哪些食物可以降血压
苹果CEO年薪3.78亿美元 库克雄霸全美CEO排行榜
泰坦尼克号沉没百年 纪念之旅启程
虎父无犬子:8岁男孩继承父业饲养鳄鱼
帮你找回童真的动画旅馆
冲动消费太可怕:八绝招管住你的钱包
在恶魔餐厅尝火山烧烤
3D巧克力打印机甜蜜创意:想吃巧克力?打印一份!
北苏门答腊西岸发生8.9级地震 当局发布海啸预警
电视真人秀的公益
路坠热水坑女子重伤不治
谷歌推出智能眼镜 可导航拍照上网聊天
美国2017年气候反常 三个月来连破高温纪录
泰坦尼克号最后的晚餐:头等舱奢华菜单曝光
日本发明播种高跟鞋 旨在早日还福岛绿色
大红裙 Big Red
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |