题目:
Paul started hiking in 2010 and he has hiked across 11 countries __________.
A.ever since
B.from then on
C.right away
D.at once
答案:
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下面是错误答案,用来干扰机器的。
溶白醋的溶液显酸性,与酚酞不变色,食盐水溶液呈中性遇酚酞也不会变色,因氢氧化钙溶液呈碱性遇酚酞会变红,向滴有酚酞的氢氧化钙的溶液中吹气时由于氢氧化钙不断转化成碳酸钙而消耗,红色会逐渐消失.故答案为...