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问题 单项选择题

运行中的变压器保护，当现场进行什么工作时，重瓦斯保护应由“跳闸”位置改为“信号”位置运行（）。

A、进行注油和滤油时

B、变压器中性点不接地运行时

C、变压器轻瓦斯保护动作后

答案

参考答案：A

完形填空

In the days when an ice cream cost much less, Tom, ___31   __   8-year-old boy, entered a hotel coffee shop ___32   __   sat at a table. A waitress put a glass of water in front of him. “How much is an ice cream?” “Fifty-cents,” replied the waitress. The little boy pulled __33 _         right hand out of the pocket and studied a number of      34          in it. “How much is a dish of plain ice cream?” he asked. Some people were now waiting for her service and the waitress grew a bit __35    _  (patience). “Thirty-five cents.” she said __36 _      (rude). The little boy carefully counted the coins ___37___      .“I will have a plain ice cream,” he said. The waitress walked _38    __ __    . The boy finished the ice cream, paid the cashier and left. It was not long _39  __        the waitress came back and then she began to wipe down the table and suddenly was surprised at what she saw. There, _40  __        (place) neatly beside the empty dish, were two nickels and five pennies — her tip!
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选择题

下列现象在人类社会出现的先后顺序是

①早期智人②母系氏族③人种差异④私有财产⑤父系氏族[ ]

A．①②③④⑤

B．④③①②⑤

C．②①③④⑤

D．①③②⑤④
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