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[00:05.20]Lesson 53 1 Dialogue

[00:08.28]第53课 1 对话

[00:11.36]Jane and Zhou Lan are in London.They are wondering what to do today.


[00:17.92]JANE:What shall we do today?The weather's not very good.


[00:23.88]ZHOU LAN:I feel like going to a museum.

[00:28.42]It's too wet to go walking around London.

[00:30.90]ZHOU LAN:我想去博物馆。天气太湿不能逛伦敦。

[00:33.38]JANE:I agree.Which museum would you like to visit?


[00:39.03]What about the Natural History Museum?So far as I know,it's free.

[00:43.30]ZHOU LAN:自然历史博物馆。就我所知,自然历史博物馆是免费的。

[00:47.57]No,not any more.It used to be free but now you have to pay to get in.


[00:56.22]ZHOU LAN:What about you?What do you feel like doing?

[00:58.95]ZHOU LAN:你呢?你想做什么?

[01:01.68]JANE:Personally,I'd rather go to the Science Museum.


[01:07.11]They've got a special exhibition on this month.

[01:12.67]It's all about space and satellites.


[01:17.32]ZHOU LAN:I'd like to see that too.

[01:19.31]ZHOU LAN:我也想去看.

[01:21.29]I'm planning to do a special study of satellites next term.


[01:27.75]Maybe I could find out some useful information.


[01:33.60]JANE:Fine!Why don't you get your things ready?


[01:38.77]I'll tell my mother what we've decided to do.


[01:44.02]Lesson 54 2 Reading comprehension

[01:50.11]第54课 2 阅读理解

[01:56.19]Read the passage to find the answers to these questions:


[02:01.65]1 Why are satellites so expensive?

[02:04.28]1 为什么人造卫星会这么贵?

[02:06.90]2 What can satellites send back to the earth?


[02:12.57]SATELLITES (1)


[02:16.33]The moon travels round the earth once every month.


[02:22.39]It is a natural satellite of the earth.


[02:27.25]A satellite is an object,either natural or man-made,


[02:34.91]which travels in an orbit round another object in space.


[02:41.75]Man-made satellites are carried up into space by rockets.


[02:48.91]To escape the pull of the earth,

[02:53.06]a rocket must reach a speed of 28,440 km/h.


[03:03.01]If the rocket does not reach this speed,

[03:07.87]it will fall back to the earth.


[03:11.84]A satellite is one of the most expensive pieces

[03:17.41]of scientific equipment in the world


[03:22.06]First,it must be very light,the lighter the better,


[03:28.59]because it has to be sent up into space by a rocket


[03:34.65]Second,it usually contains very expensive cameras.


[03:42.12]It has equipment for making electricity from sunshine,

[03:48.96]using very broad sun panels.


[03:53.82]These are folded up inside the satellite.


[03:59.78]Once the satellite goes into its orbit round the earth,


[04:06.44]the panels are unfolded in order to catch the sunshine.


[04:13.60]There is a rocket motor on the satellite


[04:18.64]by which the direction of the satellite can be changed if necessary


[04:25.80]Satellites for broadcasting


[04:29.95]are used to send radio

[04:34.10]and TV programmes from one part of the world to another.


[04:40.35]Most of these satellites do not change their positions


[04:46.41]They remain above the same place on the earth

[04:52.05]and travel round it in a very high circle.


[04:57.69]In this way,they are able to connect broadcasting stations


[05:04.54]which are a long distance from each other.


[05:09.39]Signals travel at the speed of light.


[05:14.85]They reach the satellite and return to the earth in less than a second.


[05:22.72]Weather satellites send information and photos of weather conditions


[05:30.08]to weather stations on the earth.


[05:34.45]It is therefore possible to say not only what the weather is like at present,


[05:42.60]but also what is likely to happen in the next day or two.


[05:50.17]This is very useful when there is a hurricane in an area,


[05:56.94]As It Is possible to see the path of the hurricane in the satellite pictures.


[06:04.98]Ships and planes can be warned

[06:10.16]so that they can keep out of the path of the hurricane.


[06:15.90]Lesson 55 1 Reading comprehension

[06:21.79]第55课 1 阅读理解

[06:27.68]SATELLITES (2)


[06:31.94]In 1964 a group of 17 countries


[06:38.00]set up an organization for sending telephone signals by satellite.


[06:44.77]Their first satellite was called Early Bird.


[06:49.91]Today there are more than 100 nations in this group


[06:55.76]and dozens of satellites have been put into space.


[07:00.94]You can telephone somebody on the other side of the world


[07:06.50]with the help of a satellite.


[07:11.26]Satellites are used more and more

[07:15.62]to take photos of the earth and to produce maps.


[07:21.18]Special cameras can produce pictures

[07:25.73]showing where different metals can be found.


[07:30.09]They can tell the difference between health plants

[07:35.05]and plants that are diseased.


[07:38.61]This is useful for scientists who work in forests and in agriculture.


[07:45.06]There are many research stations on the earth


[07:49.60]in which outer space is studied.


[07:53.36]The problem with looking into space from the earth


[07:58.04]is that there is a lot of dust in the earth's air.


[08:02.90]The dusty air makes it difficult to get a clear picture of space.


[08:09.06]With space satellites there are no such problems.


[08:14.03]They are being used more and more to collect information about space,


[08:20.40]to carry out experiments and to send the information back


[08:26.04]to research centres on the earth.


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