题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。Go (围棋) is a board game for two players, in which the aim is to surroundmore territory than the competitor. The game (invent) in China more than 2,500 years agoand is believed to be the (old) board game continuously played to thepresent day. A 2020 survey found that there are over 20 million currentplayers, the majority of live in East Asia.The playing pieces arecalled stones. One player uses the white stones and other black. The playerstake (turn) to place the stones on the vacantintersection17．用化学方程式解释下列有关原理．（1）工业上用一氧化碳还原赤铁矿来炼铁．（2）乙醇被用作酒精灯、火锅、汽车等的燃料．（3）胃酸过多时，可服用含氢氧化镁的药物来减轻症状．