题目：
| 完形填空。 | ||||
| It was half an hour before midnight on December 24th last year. I was a ticket-counter supervisor (主管) for a major airline and was looking forward to the 1______ of my shift (轮班) at Stapleton International Airport in Denver. My wife was waiting up for me at home so that we could 2______ our gifts for Christmas. Just then, a very 3______ gentleman went up to me: He asked how he could get to Cheyenne, Wyoming. He had just arrived from Philadelphia and 4______ his connecting flight. I pointed him to the ground transportation area, where he could rent a 5______. And then I called ray wife to let her know I would be home 6______ About fifteen minutes later, the gentleman 7______ and informed me that all the buses were full and there were no cars 8______. I told him that he had to stay for a night ai the airport. Hearing that, he burst into 9______. I tried to make him calm down. He explained that his name was Tom, and that his only son was 10______ ill at home and was not expected to 11______ another year, He expected that this would likely be the 12______ Christmas with his son. I told Tom to 13______ his luggage and wait for me at the gate. I was driving to Cheyenne. I called my wife Kathy, telling her about it and not to wait up for me. I drove fast 14______ and we arrived in Cheyenne around 2:30 a.m. Kathy was still 15______ me when I got home in the early morning. We traded gifts and then our conversation 16______ Tom. For Kathy and me, there was no 17______ that driving Tom to Cheyenne was the 18______ choice. A couple of days later, I 19______ a Christmas card with a picture of Tom and his family. In it, Tom thanked me for the special 20______ lie had received that holiday season, but I knew the best gift was mine. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：A．铜和稀硝酸制一氧化氮，3Cu＋8HNO3(稀)=2Cu(NO3)2＋2NO↑＋4H2O。产生的NO不能与硫酸发生反应，所以经硫酸干燥后，在收集时由于NO密度比空气小，而且容易与氧气发生反应，所以不能用排空气法...
