8. 밑줄 친 부분 중 어법상 옳지 않은 것은?
To find a good starting point, one must return to the year 1800 during ①which the first modern electric battery was developed. Italian Alessandro Volta found that a combination of silver, copper, and zinc ②were ideal for producing an electrical current. The enhanced design, ③called a Voltaic pile, was made by stacking some discs made from these metals between discs made of cardboard soaked in sea water. There was ④such talk about Volta’s work that he was requested to conduct a demonstration before the Emperor Napoleon himself.
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- 2②

- 3③

- 4④
