Unit 7 Can you see the lightning? Section A 课件

课件19张PPT。Unit 7 Can you see the lightning?
Section A 打雷时,空气中会产生大量的负离子，他们互相碰撞会产生电荷，这些负离子会依附在比较高的物体上，容易吸引雷电，雷电劈下来是带着极大的电流的，由于树不是一个好的导体，树干的阻力比较大，所以电流会停止从树上直接泻到大地。人在树躲雨的过程中，在这个大树的雷电下来到达人头顶上的时候，有一个电弧闪落，闪过来之后打在人的头上，又通过人体一直泻放到地底下去，就是这么个原因。 懂得了这些常识，人们就不会去躲在树下了，毕竟人们还是比较珍惜生命的 雷雨天气安全常识
1、雷雨闪电时，不要拨打接听电话，要关闭手机，因电话线和手机的电磁波会引入雷电伤人。
2、雷雨闪电时，不要开电视机、电脑、VCD机等，应拔掉一切电源插头，以免伤人及损坏电器
3、不要站在电灯泡下，不要冲凉洗澡。
4、尽量不要开门、开窗，防止雷电直击室内。
5、乘坐汽车等遇到打雷闪电，不要将头手伸出窗外。 　
6、在雷阵雨较大时要远离树木，尽量不要大跨步跑动，可以选择建筑物躲雨，但不宜选择车内躲雨。 　　
7、不要把晾晒衣服被褥的铁丝，拉接到窗户及门上。 　　
8、不要穿戴湿的衣服、帽子、鞋子等在大雷雨下走动。对突来雷电，应立即下蹲降低自己的高度，同时将双脚并拢，以减少跨步电压带来的危害。 　　 9、闪电打雷时，不要接近一切电力设施，如高压电线变压电器等。
There is a big storm this morning and John cannot go to school.John : It’s 7:30.I must go to school now.John : I will use an umbrella.John : I will put on my raincoatJohn : Yes ,I can.John : It’s dangerous.John : Mum, look at the black rain clouds in the sky .Mum : This is a big storm.Mum : Look ! Can you see the lightning? Can you hear the thunder?Mum : No! The wind is too strong.Mum : No! The rain is too heavyMum : Don’t stand near the window, John.Mum : That’s right.Look ,listen and actThere is a big storm this morning and John cannot go to school.John : It’s 7:30.I must go to school now.John : I will use an umbrella.John : I will put on my raincoatJohn : Yes ,I can.John : It’s dangerous.John : Mum, look at the black rain clouds in the sky .Mum : This is a big storm.Mum : Look ! Can you see the lightning? Can you hear the thunder?Mum : No! The wind is too strong.Mum : No! The rain is too heavy.Mum : Don’t stand near the window, John.Mum : That’s right.Look ,read and actcannot 是can的否定形式，也可缩写成can’t，其后接动词原型这里的too是“太”的意思，而不是“也”a用于辅音前，an用于元音前 Can you see the lightning?Yes, I can./ No ,I can’t.read and sayA:B:这是一个一般疑问句，直接将can提前就可以了，肯定回答是Yes，主语+can。否定回答是No，主语+can’t。 e.g. Can you hear the thunder?
Yes, I can./No, I can’t rain cloudsthunder and lightning['θ?nd?] ['la?tn??] window
['w?nd??] umbrella
[?m'brel?] storm
[st??m] raincoat
['re?nk??t] strong
[str??] dangerous
?['de?n(d)?(?)r?s]
Activity 2Talk about weather and clothesWork in groups. Look at the weather pictures. Talk with your friends. What will you wear? What will you use? weather words: sunny, windy, cloudy, warm, hot, cool, cold, rainy, snowy, storm Clothes words: sweater, coat, jacket, T-shirt, dress, skirt, scarf, raincoat, hat, cap Other things: fan, umbrella, boots回忆一下问天气是怎么问的？How is the weather?
It’s cloudy.
It’s hot, I will wear a skirt. It’s sunny. I will wear a cap.考考你！1、 It’s .I will wear . 2、It’s . I will use an . 3、It’s . I will wear my . sunnya hatrainyumbrellasnowyjacketActivity 1Talk about a stormWork in pairs. Look at the pictures and talk about them .E.g. Don’t stand near a window. It’s dangerous. listen to the radio swimplay in the rainstand near a window stand under a treeride your bikewatch TVuse your computerThanks for your attention，goodbye！