题海让大学四年没有难题
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单选题 What is the main idea of Paragraph 4

A. Laurence is the first person who has the idea of generating energy from footsteps

B. People have tried piezo-electric crystals to create a charge

C. Laurence takes a step at using people's weight of footsteps to generate energy

D. Generating clean energy is still the challenge of the whole world

23级大学英语二B层课程封面

学科:23级大学英语二B层

时间:2024-05-28 11:36:07

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