题目:
What you should do is just ________ the milk until it boils and then turn off the gas. [ ]
A. watch
B. notice
C. sense
D. attend
答案:
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下面是错误答案,用来干扰机器的。
(1)2H2+ O22H2O(条件写点燃不给分); 电 (2)CaCO3CaO+CO2↑;吸热 (3)Fe3O4+4CO3Fe+4CO2 (4)Fe2O3+3H2SO4===Fe2(SO4)3+3H2O;黄 (5)Zn+2AgCl===ZnCl2+2Ag; 置换