海洋中有丰富的食品、矿产、能源、药物和水产资源，下图为海水利用的部分过程。

下列有关说法正确的是

A．过程①中除去粗盐中的SO、Ca^2＋、Mg^2＋、Fe^3＋等杂质，加入的药品顺序为：Na₂CO₃溶液→NaOH溶液→BaCl₂溶液→过滤后加盐酸

B．用澄清的石灰水可鉴别NaHCO₃和Na₂CO₃

C．过程②中结晶出的MgCl₂·6H₂O要在HCl氛围中加热脱水制得无水MgCl₂

D．工业上通过电解饱和MgCl₂溶液制取金属镁

单词拼写(共5小题，每小题1分，满分5分)

根据汉语提示，用单词的正确形式填空，每空一词。

小题1:Rose went to the seaside and enjoyed ____________(她) the day before yesterday.

小题2:My sister studies hard, she often finishes her homework _________(容易).

小题3:As we know,__________(吸烟) is a bad habit, it’s not good for ou health.

小题4:I like lots of vegetables, such as cabbages, carrots and __________(西红柿).

小题5:Many Chinese students have come to realize the ________(重要) of learning English.