患者男性，27岁，因"左下颌部肿痛3个月余"入院，查体：左下颌角肿胀，左面部浅静脉怒张，皮肤表面温度升高；X线片示左下颌骨质破坏，血液碱性磷酸酶升高。
关于该疾病正确的是（）.
A.好发于中年患者
B.男女发病率相似
C.易发生淋巴结转移
D.皮肤破溃少见
E.碱性磷酸酶越高预后越好
参考答案：D
解析：颌骨骨肉瘤好发于30岁左右青年，男性较女性多见。由于肿瘤不断生长，可见面部皮肤静脉怒张，皮肤表面温度升高，皮肤绷紧发亮，但鲜见皮肤穿破溃烂。血液碱性磷酸酶具有重要诊断意义，其含量越高则预后越差。
阅读下面短文，掌握其大意，从各题所给的A、 B、 C、D 四个选项中，选出一个最佳答案。 One day a father and his 5-year-old son were decorating（装饰） the Christmas tree. A little boy about six years old came to the front door begging. In Mexico, people taking begging as a normal ____1____ of life. People just accept it and they give ____2____ they have. When they saw the little boy, the father and the son went to the front door. The little boy was ____3____ dressed and seemed very cold. The father went back with his son and said to him, “give him one of your___4___.” The little boy opened his box and ____5____ an old one, but his father said to him, “No, no---give him your ____6____”And the little boy, like a little tiger, shouted, “no way!” He cried and refused to give what he liked best to the little boy. ____7____ the father insisted (坚持) softly, “No, you must give him one of your favorite toys. He may not have a mom or dad. It’s ____8____ outside, yet he can’t stay at home to sit by a fire to enjoy the ____9____ of Christmas.” Hearing that, the boy, with his ____10____ down, picked out a toy he had just got. He walked to the front door with the toy in his hand, and the father ____11____ in the living room. After about ten ____12____, his son came running back into the living room. “Daddy, can I give him ____13____ one” shouted the little boy happily. The father did not know what had happened to his son and the little boy, yet he felt very ____14____ that his son finally understood the joy of ____15____.
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