①加水溶解 ②加热蒸发得到晶体 ③加入过量BaCl2溶液 ④加入过量盐酸 ⑤加入过量K2CO3⑥过滤 ⑦加入过量KOH.
A:①⑤③⑦⑥④②
B:①⑤⑦③④⑥②
C:①⑦③⑤⑥④②
D:①⑦③④⑥⑤②
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— Are you confident about the English Speech Contest, Sally?— __________. I've got everything ready!