有关骨肉瘤的临床特点，下列哪项是正确的（）。
A.骨肉瘤好发于四肢骨骺生长最快的股骨远端、胫骨近端和肱骨近端
B.骨肉瘤绝大部分为多发
C.一旦病理学检查确诊为骨肉瘤，应该马上行截肢手术
D.骨肉瘤也较多发于脊柱、骨盆
E.全部病人80%～90%病变发生于膝关节周围
参考答案：A
解析：骨肉瘤大部分单发，多发于四肢骨骺生长最快的股骨远端、胫骨近端和肱骨近端。
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| During the years of depression(萧条), food and money were very hard to find and people had to trade things with each other. One day I was 1 some potatoes from Mr Miller. I noticed a small poor boy hungrily 2 a full basket of freshly picked green peas. Then I was 3 to see that Mr Miller sold the boy a bag of peas fo r just a marble (弹球). Mrs Miller, who had been standing nearby, 4_ and told me that Mr Miller loved to trade with the three boys in the village for peas, tomatoes, and other things 5 he didn't really need any marbles. I left the stand, smiling to myself, 6 by this man. Several years went by. One day I learned that Mr Miller had died. I took part in the funeral(葬礼), _7 three young men . They came over to Mrs Miller, hugged her, kissed her on the cheek, spoke with her and moved on, 8 their eyes. Our 9 came to meet Mrs Miller. I mentioned 10 she had told me about the 11 She told me, " Those three young men above were the boys I told you about. They just told me 12 they appreciated the things Jim 'traded 'with them. Now, at last, they came to pay their debt." "We've 13 had a great deal of the wealth in this world," she 14 , "but right now, Jim wouldW#W$ W%.K**S*&5︿U consider himself to be the 15 man." Then she gently lifted the 16 fingers of her husband. Resting underneath were three red marbles. At that time I realized that we would not be 17 by our words, but by our kind 18 . It is said that it takes a minute to find a 19 person, an hour to appreciate him, a day to love him, but an entire life to 20 him. | ||||
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