Lisa sang as ______ as Mary in yesterday’s singing competition.

A. well B. good C. better D. best

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To deal with this problem, the scientists put eight motors (發(fā)動機) and two sensors (傳感器) that read how the machine is working. They all give signals (信號) 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.

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