问题
单项选择题
如果～是集合S上的一个等价关系则应该具有下列哪些性质？（）
A、反身性
B、对称性
C、传递性
D、以上都有
答案
参考答案：D
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如果～是集合S上的一个等价关系则应该具有下列哪些性质？（）
A、反身性
B、对称性
C、传递性
D、以上都有
参考答案：D
On August 26, 1999, New York City experienced a torrential downpour. The rain caused the streets to __16__ and the subway system almost came to a stop. Unfortunately, this happened during the morning rush hour. Many people who were going to work were __17__ to go home. Some battled to __18__ a taxi or to get on a bus. Still others faced the __19__ bravely, walking miles to get to work. I __20__ to be one of the people on the way to work that morning. I went from subway line to subway line only to find that most __21__ had stopped. After making my way __22__ crowds of people, I finally found a subway line that was _23__. Unfortunately, there were so many people waiting to __24__ the subway that I could not even get down the stairs to the __25__. So I took the train going in the opposite direction, and then switch back to the downtown train. Finally, after what seemed like an forever journey, the train __26_ my stop. Then I had to walk several blocks in the increasingly heavy rain. When I finally got to my office, I was __27__ through, exhausted and __28__. My co-workers and I spent most of the day drying off. When it was 5:00 pm，I was ready to go home. I was about to turn off my computer __29__ I received an email from Garth, my Director: I would like to thank all of you who made the effort and __ 30__ reported to work. It is always reassuring(令人欣慰), at times like these, when employees so clearly show their __31__ to their jobs. Thank you. Garth’s email was short, but I learned more from that __32__ message than I ever did from a textbook. The email taught me that a few words of __33__ can make a big difference. The rainstorm and the traffic __34__ had made me tired and upset. But Garth’s words immediately__35__ me and put a smile back on my face.
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