题目

Dick is a sailor(船员) on a big ship. It went to Japan and Australia, so Dick was often on the ship for several months at a time. When he woke up in the morning and looked out, he only saw the sea, or sometimes, a port(码头),during these trips. When he was twenty-six, Dick got married and bought a small house with a garden in his wife’s town. It was away from the sea, then he had to go back to his ship and he didn’t come home for two months. Two months later, he went from the port to town by bus, and was very happy to see his wife again.The next morning he slept until 9 o’clock. Then在中央电视台体育频道的围棋讲座中你会发现,棋子在竖直放置的黑板上可以移动,但不会掉下来.原来,棋盘和棋子都是由磁性材料制成的.棋子不会掉落的原因是( )A.质量小,重力可以忽略不计B.棋盘对它有很大吸引力C.受到棋盘对它向上的摩擦力D.受到空气的浮力
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