题干

丹麦的物理学家____发现了电流的磁效应.用安培定则判定直线电流的磁感线方握住直导线(选填“左手”、“右手”),使伸直的大拇指指向____方向(选填“电流”、“磁感线”、“运动”).

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奥斯特,磁感线

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    In US, the potato is one of the most widely consumed crops. French fries are commonly found in typical American fast-food burger joints and cafeterias. French fries were introduced to the US when Thomas Jefferson served them in the White House during his presidency from 1801 to 1809. Potato chips are popular with consumers as well.

    The humble potato is more than just a kind of food. In many ways it's part of the American pop culture. Let's take a look at some pop culture potatoes.

Mashed Potato dance

    The Mashed Potato dance is a craze that began in 1962. The name of the dance came from the song it accompanies, Mashed Potato Time, performed by American R&B singer Dee Dee Sharp. The move vaguely resembles that of the Twist dance style, by Sharp's fellow Philadelphian.

Chubby Checker.

Hot Potato!

    Hot Potato! is an action puzzle video game released in 2001. In the game the player must drive a bus and clear the road of alien potato beings. The potato beings are either red or blue; when two like-colored potatoes touch each other, they disappear. Over the years, Hot Potato! has received mostly positive reception from critics.

Mr. Potato Head

    Mr. Potato Head is an American toy invented by George Lerner in 1949. The toy consists of a plastic potato model and a variety of plastic parts like hands, feet, ears and mouths. In 1952, Mr. Potato Head became the first toy advertised on television. This commercial revolutionized marketing and caused a boom that solidified this toy's place in American pop culture.