题目：
| 完形填空。 | ||||
| Love in a Box When I was a little girl, I found love in a box all because of a class assignment. On a Friday night I 1 at the dinner table, "My teacher said we have to bring a box, a special box, for our Valentines (情人节) on Monday." Mother said, "We'll see", and she continued eating. What did "We'll see" mean? I had to have that box 2 my second grade Valentine's Day would be a disaster. Maybe they didn't love me enough to help me with my 3 . All Saturday I waited 4 and with Sunday arriving, my concern increased, but I 5 an enquiry about the box might 6 anger or loud voice, for in my house children only ask once. More than that 7 trouble. Late Sunday afternoon, my father called me into the kitchen. The table was covered with colorful 8 of different kinds. A(n) 9 shoebox rested on top of it. 10 flooded through me when Daddy said, "Let's get started 11 your project." In the next hour my father 12 the shoebox into an impressive valentine box. Colorful paper covered the ugly cardboard with red hearts 13 to what I considered all the right places. He sang while he worked. When he finished, he was so delighted that a 14 smile spread over his face. "What do you think of that?" he asked. I answered him with a hug. But inside, 15 danced all the way to my heart. It was the first time that my father devoted so much 16 to me, for his world consisted of work only. The holiday party arrived, and my classmates put cards, and presents into the valentine boxes. Laughter filled our classroom until dismissal time 17 . On the way home, I held out my valentine box for the world to 18 . The love that filled it meant more to me than all inside. The valentine box became a symbol of his love that 19 through decades of other Valentine's Days. He gave me other gifts through the years, but none 20 compared with the love I felt within the limits of the old, empty shoebox. | ||||
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答案：D题目分析：A、铜和浓硝酸、浓硫酸反应的产物中都有盐和水及还原气体，都表现出强氧化性和酸性，正确；B、露置在空气中，浓硫酸吸水性使硫酸浓度降低，浓硝酸易挥发使浓度降低，正确；C、铝与浓硝酸、浓硫...
