男性，56岁，上颌牙列缺失，下颌剩余右侧45，和左侧234。其中右侧4松动Ⅱ度，近中倾斜并向对颌伸长，牙槽骨吸收至根中1/3；右侧5松动Ⅰ度；左侧2、3为残根。叩（-），X线片示剩余根长10～15mm，未行RCT，根尖区无阴影；左侧4松Ⅱ度，近中倾斜，向对颌伸长，牙槽骨吸收至根中1/3。
在下列修复方案中您认为本病例采用哪种方案修复较合适（）.
A.上颌总义齿，下颌可摘局部义齿修复
B.上颌总义齿，下颌前牙固定桥修复，后牙可摘局部义齿修复
C.上颌总义齿，下颌前牙可摘局部义齿修复，后牙固定桥修复
D.上颌总义齿，下颌剩余右侧45和左侧234经过RCT后，覆盖义齿修复可在右侧5和左侧3上放置磁性附着体
E.上颌总义齿，下颌拔除右侧4和左侧4后，左侧23经过RCT后可摘局部义齿修复
参考答案：D
Sometimes we need to remind ourselves that thankfulness is indeed a virtue (美德). William Bennett Thanksgiving Day was coming. The first grade teacher gave her class a fun assignment (作业) — to draw a picture of for which they were thankful. Most of the class might be considered poor, but still many would the holiday with turkey and other traditional food of the season. These, the teacher thought, would be the subject of most of her students’ art. And they were. But Douglas made a(an) kind of picture. Douglas was a different kind of boy. He was the teacher’s true child of weak and unhappy. As other children played at , Douglas used to stand close by her side. One could only guess at the pain that Douglas felt behind those sad . Yes, his picture was different. When he was asked to draw a picture of something for which he was thankful, he drew a . Nothing else. Just an empty hand. His abstract (抽象的) picture caught the of his classmates. Whose hand could it be? One child guessed it was the hand of a farmer, because farmers turkeys. Another suggested a police officer, because the police protect and people. Still others guessed it was the hand of God, for God feeds us. And so the discussion went on — until the teacher almost forgot the young artist . When the children had gone on to other assignments, she stopped at Douglas’ desk, bent down, and him whose hand it was. The little boy looked away and murmured, “It’s yours, teacher.” She recalled the when she had taken his hand and walked with him here or there, as she had the other students. How she had said, “Take my hand, Douglas, we’ll go outside.” Or, “Let me show you how to hold your pencil.” Or, “Let’s do this together.” Douglas was very for his teacher’s hand. Brushing aside a tear, she went on with her work. The story speaks of more than thankfulness. It says something about teachers teaching and parents parenting and friends showing friendship, and how much it means to the Douglases of the world. They might not always say thanks, but they’ll remember the hand that out.
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