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人教版(新课程标准)高中英语必修一Unit 2 English around the world同步练习1

作者UID:7914996
日期: 2024-11-12
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    You carry a 1.3 kg mass of fatty material in your head that controls everything you will ever do. This fantastic control center lets you think, learn, create, and feel emotions. It also controls everything your body does. What is this amazing machine? It's your brain — a structure so amazing that the famous scientist James Watson called it "the most complex thing we have yet discovered in our universe".

    Imagine your kitten jumped onto the kitchen counter, and was about to step onto a hot stove. You would have only seconds to act. In situations like this, your brain reads the signals from your eyes and quickly calculates when, where and at what speed you need to run to save her. Then it tells your muscles to move. No computer can match your brain's great ability to download, process, and react to the flood of information from your eyes, ears and other sensory organs.

    If a bee lands on your foot, sensory neurons(神经元) in your skin send this information to your brain at a speed of more than 240 kilometers per hour. Your brain then uses motor neurons to send a message back to your foot: Shake the bee off quickly! Motor neurons can send this information at more than 320 kilometers per hour!

    Your brain contains about 100 billion tiny cells: neurons — it would take you more than 3,000 years if you tried to count them all. Whenever you dream, laugh, think, see or move, tiny chemical and electrical signals are racing between these neurons along billions of tiny neuron pathways. Believe it or not, the activity in your brain never stops. Countless messages fly around inside it every second, like a super-fast game of table tennis. Your neurons create and send more messages than all the phones in the entire world. And although a single neuron generates only a tiny amount of electricity, all your neurons together can generate enough electricity to power a light bulb.

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    Maureen stood by the lake. Suddenly the children came running through the trees with sharp cries of 1 They rushed up to the 2leaning over the clear water, watching the crowds of tiny fish. Some children demanded loudly to go to the boats, but 3those who had been left behind at the ice-cream stall(小摊) came running up to make some announcement or other, and they all4the water and dashed back the 5 they had come. With growing excitement, Maureen6them.

    When she7what had been running for, she stopped running. They were 8things again. The toy stall was9and they were crowded around it. Behind the 10 a calm middle-aged woman was selling a great variety of small rubbish. She took 11from the forest of small hands in exchanging for little boats, plastic dolls, yellow pencils, anything. Maureen leaned against a 12 looking on. The idea of13 washed against her face like a strong current(流), trying to draw her in.

    Nona Parker pushed out to the edge of the group and14what she had bought on the ground so that she could see what money she had left in her white purse. Under Maureen's 15 lay a boat, a mouth organ(口琴) and a brown load of bread. Maureen was so full of the16for the things like that she couldn't bear to look at it. She turned her17sharply. Her face was against the tree. She shut her eyes and 18 eagerly for some money, for the price of a set of toy plates. In a moment, she opened her eyes,19she didn't turn back to the stall. It was too 20to see the others buying whatever they wanted. She rubbed almost round the tree, her eyes on the ground.

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