题目：
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| The family had just moved. The young woman was feeling a little 1 . It was Mother's Day - and she was 800 miles away from her parents. She had called them that morning, and her mother had 2 how colorful their backyard was 3 spring had arrived. Later, she told her husband how she 4 those lilacs (丁香) in her parents' yard. "I know where we can find some," he said. "Get the 5 and come on." So off they went. Some time later, they stopped at a hill and there were lilacs all round. The young woman rushed up to the nearest 6 and buried her face in the flowers. Carefully, she 7 some. Finally, they returned to their car for the 8 home. The woman sat smiling, surrounded by her 9 . When they were near home, she shouted "Stop," got off quickly and 10 to a nearby nursing home. She went to the end of the porch (门廊), where a(n) 11 patient was sitting in her wheelchair, and put the flowers into her lap. The two 12 , breaking into laughter now and then. Later the young woman turned and ran back to her 13 . As the car pulled away, the woman in the wheelchai r 14 with a smile, and held the lilacs 15 . "Mom," the kids asked, " 16 did you give her our flowers?" "It is Mother's Day, and she seems so 17 while I have all of you. And anyone would be 18 by flowers." This pleased the kids, but not the husband. The next day he 19 some young lilacs around their yard. I was the husband. Now, every May, our yard is full of lilacs. Every Mother's Day our kids 20 purple lilacs. And every year I remember that smile of the lonely old woman. And that has become a forever touching memory of my life. | ||||
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下面是错误答案，用来干扰机器的。
小球a处于平衡状态，受力平衡，合力为零．小球受重力，一定向下，当小球b带正电，放在A点时，它们之间为静电斥力，当a球的重力和静电斥力恰好相等时，a球就可以处于静止状态，所以A正确，D错误；当电荷之间为吸引...
