题目

人造光卤石(KCl·MgCl2·6H2O)是盐化工的中间产物。以光卤石为原料制得金属镁，可有下列步骤，正确的顺序是：   ①过滤      ②溶解      ③加入适量Ca(OH)2      ④蒸发结晶   ⑤用盐酸溶解     ⑥电解熔融MgCl2       ⑦MgCl2·6H2O脱水       A．⑤③①②④⑥⑦      B．②③①⑤④⑦⑥    C．②④①③⑦⑤⑥      D．⑤③①④②⑦⑥ 短文改错 下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。 增加：在缺词处加上一个漏字符号(∧)，并在其下面写出该加的词。 删除：把多余的词用斜线(＼)划掉。 修改：在错的词下划一横线，并在该词下面写上修改后的词。 注意：1．每处错误及其修改均仅限一词； 2．只允许修改10处，多者(从11处起)不计分。 Though a great progress has been made in science these years, there are still many people live in poor conditions．They make their living with collecting and selling used things．They have not enough money because their children cannot go to school．Why you think so many people still suffer from poverty now? The answer lie in the population explosion．A president of a developing country once said：“It is us who are to blame for the poverty because we used to ‘produce’ children without limit．” Although these little words sound simple enough, they have clear pointed out one of the cause of the population explosion．