Lisa sang as ______ as Mary in yesterday’s singing competition.
A. well B. good C. better D. best
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一 _______was the movie last night?
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—Did you buy for your parents when you came back from London?
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There are some children ________ in the park.
A. play B. plays C. played D. playing
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---_______ cups of water are there on the table? ---Four.
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B: 1.____________
A: What are you busy with?
B: 2._________ In the morning. I get up at 6:30.
A: 3.___________
B: Because I have to take the plane at 8:30 am. I have to fly to Shanghai.
A: 4.____________
B: I attend（參加） a very important meeting（會(huì)議）. In the afternoon, I fly back to Shenzhen.
A: Oh, it’s really a busy day for you. Martin, you should have a good rest（休息）.
B: 5.___________ See you tomorrow.
A. A.I have so many things to do. B. B.And then what do you do? C. C.Because I love music. D. D.Thank you. E. E.I am too busy today. F. F.Taking the plane is fast and interesting. G. G.Why do you get up so early? |
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In some science fiction movies, evil robots refuse to die, no matter how hard people fight back.
Now science fiction has become science fact. For the first time, scientists have made a robot that can take a beating and keep on going. Scientists from Cornell University made the robot, which looks like a spider (蜘蛛) with four legs.
Until now, even the most advanced robot was almost certain to break down when it was broken. That is because its computer inside simply doesn’t know how to make the machine work after its shape has changed.
To deal with this problem, the scientists put eight motors (發(fā)動(dòng)機(jī)) and two sensors (傳感器) that read how the machine is working. They all give signals (信號(hào)) to the machine’s software. Using this information, the computer can then work out the machine’s shape at any moment.
The new technology is a big advance in robot-making, scientists say, and it’s far from scary. It may someday help scientists create better man-made (人造的) arms and legs and give new freedom to people who lose them. It might also help scientists understand how people and animals work out their own sense of place in space.
“It has been difficult to design robots that can work well when the environment changes or when it’s damaged,” says Olaf Sporns of Indiana University in the US. “With this work, we are nearer to solving this problem.”
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