高一英語牛津版(下）chapter six

[00:05.49]Friend or Enemy?'Kill it!' cried Debbie. 'Certainly not,' said Simon. [00:13.74]'Why? You're not frightened of it, are you?It's only an insect.' [00:19.62]'It isn't an insect,Debbie,though it might look like one. [00:24.87]Actually, it's a very useful creature. [00:28.81]The programme I watched last night has completely changed my views on spiders. [00:34.98]Do you want to hear about it?' [00:38.24]'Not really,' sighed Debbie'but I suppose you're going to tell me anyway.' [00:43.89]'Spiders,' said Simon,ignoring her remarks, [00:48.93]'are the enemies of insects and the friends of humans. [00:53.89]That's something that Chinese farmers realized years ago [00:58.93]and scientists are only beginning to understand today. [01:04.08]'Do you know that in parts of China,in the autumn, [01:09.25]farmers build shelters for spiders and put them all over their fields? [01:15.31]They're like little cone-shaped tents made of straw [01:20.35]and the spiders can survive the winter in them. [01:24.92]When spring comes, the spiders emerge healthy and hungry, [01:30.88]at the same time as millions of insects arrive to attack the farmers' crops.' [01:38.04]So the spiders fill their empty stomachs, [01:43.37]and the fanners whose fields are protected are happy. [01:47.81]They've saved their crops and their money. [01:51.65]Because of the spiders their expenditure on insecticides is nil.' [01:58.20]'So everyone's happy except the insects,' said Debbie. [02:03.17]'Right,and now this natural method of pest control [02:08.44]is being copied all over the world.' [02:12.21]'Interesting,'said Debbie.'But now I really must go and...' 'Wait,'cried Simon. [02:20.15]'There's more.Do you know what is stronger than steel, [02:25.71]lighter than a feather and as elastic as a rubber band?' [02:30.86]'No. What is it?' [02:33.91]'It's the silk that spiders make their webs with. [02:38.28]And scientists are trying to develop a material with similar properties. [02:43.63]They plan to use it in spacecraft,artificial organs like hearts, [02:49.80]and to make really bullet-proof vests.' [02:54.05]'I still think spiders are nasty,' said Debbie. [02:58.63]'Their bites are poisonous, aren't they? They're dangerous.' [03:03.59]'To insects, yes, but to people, rarely. [03:08.03]But even their poison is useful. [03:11.69]Doctors think it might be used to treat brain disorders in humans.' [03:16.94]'That's good news for you, then,'laughed Debbie. [03:21.01]'But seriously,I get your point, Simon. [03:24.85]We should try to understand things in nature and not destroy them.' [03:29.71]LISTENING [03:34.39]Understanding descriptions and identifying pictures [07:36.07]MORE LANGUAGE INPUT(Ⅵ) [07:40.02]Reading [07:44.69]Small creatures? [07:47.57]People often think that insects are small delicate creatures. [07:52.61]But in reality, they are tough animals. [07:56.87]As a group,they are much tougher than many bigger animals that we know well [08:02.74]such as birds and fish, cats and dogs. [08:07.39]Insects have six legs and three body parts. [08:12.96]Their antennae and shells help them to detect and protect. [08:18.10]Can you imagine that insects, [08:21.76]with their special body structure and power of senses, [08:26.23]destroy about 10% of the world's food supplies every year? [08:31.87]Insects have an ability to breed rapidly. [08:36.62]This enables them to develop large populations. [08:41.38]If you put all the insects in the world together, [08:45.82]they would weigh more than all the people [08:49.79]and the rest of the animals on the earth! [08:53.63]Small creatures? [08:56.37]Yes,but with enormous strength. [08:59.90]Listening [09:04.47]Food Web [09:07.11]All living things,except plants, depend on other living things. [09:13.27]They eat other species but are also eaten by still others. [09:18.73]They are part of a food chain or a food web inthe world of nature. [09:25.50]In this listening exercise,you will be asked to draw a food web. [09:30.83]Listen to the statements carefully. [09:34.28]Fill the missing names of the living things in the boxes. [09:38.95]Then draw arrows to show what eats what. [09:43.92]Remember the arrows in a food web always point from food to feeder.

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