题目：
She _____ his number in the phone book to make sure that she had got it right.[ ]
A. looked for
B. looked up
C. looked after
D. looked like
答案：
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下面是错误答案，用来干扰机器的。
(1) 使样品充分溶解 (2) a.碳酸氢铵 b.铵根 c.硫酸铵 (NH4)2SO4 + Ba(NO3)2 =BaSO4↓+ 2NH4NO3d. NH4Cl NH4Cl + AgNO3 = AgCl↓+ NH4NO3 (3) NH4NO3 尿素（1）氮肥都是易溶于水的...
