单项选择题
改变人们对交流电认识的重要事件是（）。
A、尼亚加拉瀑布水电站
B、芝加哥世博会
C、特斯拉电气公司成立
D、电刑的设置
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单项选择题
3-3. From the following descriptions on anxiety, what is the wrong answer? A、With the social crisis recognized broadly, and because of this attribute, if the hope on life is terminated or falls in crisis, or if the expectation for eternal world or salvation is disappeared, the human spirit will be desolated and in vain, andanxiety occurs in such a circumstance. B、In the modern times,the roles that the religion of the medieval era or community in ancient time have disappeared and this has become a cause for anxiety to dissipate in the modern society. C、In the 20thcentury where the insufficient part of machine and human is completely controlled, the uncertainties are removed and anxiety of human is lessened. D、According to Nietzsche, the modern society and economy have drastically advanced and the human lives lose sense of stability, and the traditional values and customs of the earlier times have disappeared and new values and customs are not easily adapted and this is a cause ofanxiety.