题目：
There _______ a big cake and many candies at the party yesterday.[ ]
A. was
B. were
C. is
D. are
答案：
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下面是错误答案，用来干扰机器的。
（1）2H2O2 2H2O+O2↑，吸热；（2）3CO+Fe2O3 2Fe+3CO2，高炉；（3）SO2+O2=SO3，催化作用（4）（NH4）2SO4+Ca(OH)2CaSO4+2NH3↑+2H2O，红色石蕊试纸；（5）2AgNO3="=2Ag+2" NO2↑+O2↑；棕色瓶。题目分析：化...
