题目：
| 完形填空。 | ||||
| One stormy night, many years ago, an elderly man and his wife entered the lobby (休息室) of a small hotel in Philadelphia. Trying to get out of the 1 , the couple approached the front desk hoping to get some 2 for the night. "Could you possibly give us a room here?" the husband asked. The clerk, a 3 man with a winning smile, looked at the couple and 4 , "All of our rooms are taken, 5 I can't send a nice couple like you out into the rain at one o'clock in the morning. Would you perhaps be 6 to sleep in my room? It's not 7 a suite (套房), but it will be good enough to make you folks 8 for the night." When the couple 9 , the young man pressed on. "Don't worry about me; I'll 10 just fine," the clerk said. So the couple 11 . As he 12 his bill the next morning, the elderly man said to the clerk, "You are the kind of manager who should be 13 of the best hotel in the United States. Maybe someday I'll build one for you." The clerk looked at them and smiled. The three of them had a good 14 . As they drove away, the elderly couple agreed the helpful clerk was indeed exceptional (例外的), as finding people who are both friendly and helpful isn't easy. The clerk had almost forgotten the incident 15 he received a letter from the old man. It 16 that stormy night and enclosed (附上) a round-trip 17 to New York, asking the young man to pay them a 18 . The old man met him in New York, and led him to the comer of Fifth Avenue and 34th Street. He then 19 a great new building there, a palace of reddish stone, with turrets (塔楼) and watchtowers thrusting up to the sky. "That", said the old man, "is the hotel I have just built for you to 20 ." You never know whose heart you may be touching! | ||||
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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：C题目分析：足量的铁和浓硫酸反应，随反应进行，浓硫酸浓度会降低。采用极限法，若全部生成SO2，则气体体积为20．16L，若全部生成H2，则气体体积为40．16L，所以C正确。
