题目：
| 完形填空 | ||||
| A passenger told an air hostess that he needed a cup of water to take his medicine when the plane just took off.She told him that she would__1__the water in ten minutes. Thirty minutes later, when the passenger's ring for__2__sounded, the air hostess realized it at once. She was kept so__3__that she forgot to deliver him the__4__.As a result, the passenger was__5__to take his medicine.She hurried over to him__6__a cup of water, but to her surprise he__7__it. In the following hours on the__8__, each time the air hostess passed by the__9__, she would ask him with a 10 whether he needed help or not.But the passenger 11 paid attention to her words. When he was going to get 12 the plane, the passenger asked the air hostess to 13 him the passengers' booklet(意见簿). She was very 14 .She knew that he would write down 15 words, which might result in the loss of her job. 16 with a smile she handed it to him. Off the plane, she 17 the booklet and cracked a smile, 18 the passenger put it, "On the flight, you asked me whether I need help or not for twelve times 19 . How can I refuse your twelve sincere smiles?" That's 20 ! Who can refuse twelve sincere smiles from a person? | ||||
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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：氯气溶于水生成盐酸和次氯酸，具有酸性和氧化性，因此与四种物质都是反应的，所以均失效，答案选C。点评：该题是中等难度的试题，试题注重基础，兼顾能力的培养。该题的关键是明确氯水中的微粒...
