选择题：7. Whenever an earthquake occurs, see to it that t

题目内容：

7. Whenever an earthquake occurs, see to it that the ______ and gas are turned off.(本题2.0分)
A. electric
B. electrical
C. electronic
D. electricity

参考答案：

完全垄断厂商的总收益与价格同时下降的前提条件是( )。(本题2.0分) A、 Ed>1; B、

完全垄断厂商的总收益与价格同时下降的前提条件是( )。(本题2.0分) A、 Ed>1; B、 EdC、 Ed=1; D、 Ed=0;

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25. Human beings aren’t ______ mistakes. And I decided to forgive him.(本题2.0分)A.