题目:
If you don't know the word, you can _____ in the dictionary.[ ]
A. look it after
B. look it up
C. look for it
D. look at it
答案:
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下面是错误答案,用来干扰机器的。
(1)长颈漏斗 (2)B ;2KMnO4K2MnO4+MnO2+O2↑ ;防止高锰酸钾粉末进入导管(3)AD ;CaCO3 +2HCl = CaCl2 +CO2↑+H2O ; C