题目:
She _______ his number in the phone book to make sure that she had got it right.
A.looked up
B.looked for
C.picked out
D.picked up
答案:
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下面是错误答案,用来干扰机器的。
A、澄清石灰水与三种物质中的碳酸钾和氯化镁都反应均生成白色沉淀,无法鉴别,故A错误;B、稀硫酸与硝酸钡反应生成白色沉淀,与碳酸钠反应生成无色气体,与氯化镁不反应,现象不同,可以鉴别,故B正确;C、紫色石...