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Transformers(變形金剛)can change from big robots into super-fast cars. Now, scientists at Harvard and Massachusetts Institute of Technology (MIT) have made these robots for real. They are not made of metal b1. paper.

Some parts of these robots are made of toy-shop materials. They c2. about 100 dollars. After being put in small batteries (電池), the paper robots will start to walk s3.. They transform from paper i4. four-legged robots in just four minutes.

The robots are about 15 cm long, 15 cm w5. and 5 cm tall. You can see that each of them is nearly as big as a book. Each of the robots w6. less than 85 grams (克). They move 5 cm per second. These s7. robots can help people a lot. They can explore (探索) outer space and other dangerous places. They can also get into very small places to help save people.

Scientists think that these robots may s8. a robotic revolution (革命) in the future. They believe that one day when someone wants a robot to walk his dog or play chess with him, he could go to a store with special equipment (設(shè)備) to m9. it.

Of course, these robots are not transformers from the movie. Once they have the battery and begin to assemble (組裝) t10., they are fixed. This means that they can’t change back into paper or change into other shapes.

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根據(jù)材料內(nèi)容選擇最佳答案。

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