D. it’s hard to keep one’s concentration with a crying baby nearby
参考答案A篇 1-4 DCAB
B
Nicola Tesla was born on 10th July 1856 in Croatia, a country in Eastern Europe. From a very young age, Tesla was interested in electricity. In 1881, one of the first telephone exchanges opened in Budapest. Tesla moved there and got a job. It was here that Tesla first thought of the idea of the alternating current(AC交流电).
In 1884, Tesla moved to America and worked for Thomas Edison, but only for less than a year. Tesla was sure his AC motor was the best way to capture(获取) and transport the power of electricity. However, Edison thought his way of using direct current(DC) was better and considered AC unsafe. But soon the scientific community accepted AC was more powerful than DC and it was proved safe.
In 1895, Tesla designed the first water power plant using the energy of the Niagara Falls. And he did it using the AC motor. After the success of AC, Tesla became well known. He travelled and spoke to many scientists about his inventions and ideas. He built a large laboratory where he did amazing things with lights and electricity. However, it burned down not long after it was built.
As Tesla got older, he continued to come up with new ideas and theories. But he was less successful and famous. Many people didn’t recognize that particular inventions were really Tesla’s ideas.
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