女，17岁，左膝内下硬性肿块3月，无痛。X线片示：左胫骨干骺端内_爱下问搜题

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问题单项选择题

女，17岁，左膝内下硬性肿块3月，无痛。X线片示：左胫骨干骺端内侧有一疣状突出物，大小2cm×2.5cm，界限清楚，无骨膜反应。诊断首先考虑

A．骨肉瘤

B．骨软骨瘤

C．骨巨细胞瘤

D．骨囊肿

答案

参考答案：B

解析：骨肿瘤边界清楚，无骨膜反应，这些都是良性骨肿瘤的特点，因此诊断为骨软骨瘤。骨肉瘤有典型的三角形骨膜反应，骨巨细胞瘤呈肥皂泡样改变。

完形填空

One day, when I was in high school, I saw a kid named Kyle from my class walking home from school with all his books. I thought to myself, “ 36 would anyone bring home all his books for the weekend? He must really be 37 .”
As I was walking, I saw several kids running toward him. They ran at him, 38 all his books out of his arms and he fell down in the dirt. His glasses went 39 and landed in the grass.
My 40 went out to him. So, I ran over to him. 41 I handed him his glasses, he looked at me and said, “Hey, thanks!”
I helped him pick up his books, and asked him where he lived. As it 42 , he lived near me. We talked all the way home. Over the next four years, Kyle and I became best friends.
Kyle was the 43 student of our class, one of those guys that really found 44 during high school. Therefore he had the honor to prepare a 45 speech. On the graduation day, I could see that he was 46 . So, I patted him on the back and said, “Hey, big guy, you’ll be 47 !” He looked at me and smiled.
He cleared his throat, and began. “Graduation is a time to 48 those who helped you make it through those 49 years. Your parents, your teachers…but mostly your friends. I am here to tell all of you that being a friend to someone is the best 50 you can give him.”
I just looked at my friend with 51 as he told the story of the first day we met. He had planned to 52 himself over the weekend and was carrying his books home. “Thankfully, nothing happened. My friend 53 me from doing the unspeakable(不能说出来的).”
Not until that moment did I realize that you should never underestimate(低估) the 54 of your actions. With one small gesture you can 55 a person’s life. For better or for worse.

D．congratulate

单项选择题

菠菜是卡通人物大力水手的“超级食物”，只要有了菠菜，他就力大无比，神勇无敌。不知是否是从这里获得了灵感，美国麻省理工学院的马克·鲍多领导的研究小组，最近开发出一种以菠菜叶绿素中的蛋白质为能量来源的新型电池。科学家表示，这种清洁型电池具有便携无污染等特点，经过进一步的改进，有望投入生产，未来人们借助这一技术完全可以用菠菜等来为笔记本电脑等供电。他们的研究成果发表在《纳米通讯》上。这段文字主要想告诉我们( )

A．科学家开发出以菠菜叶绿素蛋白质为能量来源的新型电池

B．菠菜可以为笔记本电脑等供电

C．以菠菜叶绿素蛋白质为能量来源的新型电池已投入生产

D．菠菜营养价值高