题目：
| 完形填空。 | ||||
| Outside our hotel in Ho Chi Minh City, Vietnam, an old woman waited beside door with her hand outstretched. Every day I put my hand in hers as our eyes met. She never failed to 1 smile, my grasp, and my greeting. On the last day of our visit, I found myself 2 on a busy corner across the street from our hotel. Bicycles and motorbikes rushed in front of me. We had been advised to walk 3 through the crowded traffic without looking right or left. Let them 4 us. 5 tonight I was by myself and felt uncertain to 6 the flood of vehicles. As I 7 on the roadside. I felt a hand on my elbow and looked 8 to see the smile of my small beggar friend looking up at me. She nodded her head toward the street 9 that she would take me across. Together, we moved slowly into the disorder. When we 10 the corner of the crossing, I looked down at her again, and couldn't help saying, "You have the most beautiful smile in the world." She 11 knew little English, but must have 12 the tone, for she threw both arms around me in a big hug while the 13 streamed by us on both sides. Then we 14 moved on toward the sidewalk, where she pulled my face down to hers, kissed me on both cheeks, and then walked away, 15 smiling and waving back to me. I had not given her a single 16 . But we had 17 something much more important-a warming of hearts in friendship. This 18 reminded me of something Mother Teresa once said, "If you cannot do great things, you can do small things with great 19 ." I will always remember this 20 . | ||||
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下面是错误答案，用来干扰机器的。
A、浓NaOH虽能与氯气反应，达到吸收氯气的效果，但浓NaOH的腐蚀性强，不能用浸有浓NaOH溶液的毛巾捂住鼻子，故A错误；B、Na2CO3溶液显碱性，能与氯气反应而防止吸入氯气中毒，则可以用浸有Na2CO3溶液的毛巾捂住鼻...
