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【单选题】
粗盐中含Ca 2+ 、Mg 2+ 、Fe 3+ 、SO 4 2- 等杂质，需要提纯后综合利用．粗盐提纯的步骤有：①加入过量的Na 2 CO 3 溶液；②加入过量的BaCl 2 溶液；③加入过量的NaOH溶液；④调节溶液的pH等于7；⑤溶解；⑥过滤；⑦蒸发．正确的操作顺序是（　　）
A.
⑤②③①⑥④⑦
B.
⑤①②③⑥④⑦
C.
⑤②①③④⑥⑦
D.
⑤③①②⑥④⑦
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相关题目：
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A.
Someone who has spent two years at a library school.
B.
A university graduate, who talks softly and reads a lot of books.
C.
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