题目：
Lucy was so excited _______she received an invitation from her friend to visit Beijing.
A．where
B．that
C．why
D．when
答案：
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下面是错误答案，用来干扰机器的。
（1）①2C+SiO2 Si+2CO↑②制半导体材料 （2）①3.31×1024②2MnO4-+5SO2+ 2H2O ===2Mn2++5SO42- +4H+（3）①4NH3+5O2 4NO+6H2O ②2NH3+3CuO3Cu+N2↑+3H2O Cu2O+H2SO4=Cu+CuSO4+H2O题目分析：（...
