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5. In the author’s opinion, in order to make fake foning look real, one has to ______.

A. talk about interesting matters
B. behave politely to people passing by
C. hold the phone while walking
D. appear absorbed in conversation

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6. What is the tone of the passage?

A. Critical.
B. Humorous.
C. Serious.
D. Unclear.

半电池反应MnO4-+8H++5e-→Mn2++4H2O，当溶液的pH值增大时，电对E(MnO4-/ Mn2+)的电极电势会

A. 减小
B. 不变
C. 无法判断
D. 增大

在K2Cr2O7 中，Cr 的氧化数是

A. +7
B. +6
C. +3
D. +2

氧化还原方程式：3Cu2S+22HNO3=6Cu(NO3)2+3H2SO4+ +8H2O，空缺处为

A. 10 NO2
B. 11 SO2
C. 11 NO
D. 10 NO