第22题: [单项选择]下列疾病属于骨关节肿瘤的是() A. 骨囊肿 B. 动脉瘤样骨囊肿 C. 骨软骨瘤 D. 关节内骨软骨瘤病 E. 腱鞘巨细胞瘤 参考答案:C 答案解析:骨软骨瘤易发生于骨软骨,骨软骨瘤是儿童期常见的良性骨肿瘤,通常位于干骺端的一侧骨皮质,向骨表面生长,又称外生骨疣。本病可分为单发性和多发性,后者有遗传倾向,并影响骨骺发育或产生肢体畸形,称为多发性遗传
A. use sense of smell more efficiently B. help them move fast and alert C. enable them to find more food D. help them live under water more easily 参考答案:D 答案解析:[试题分析] 细节推理题。 [详细解答] 关键语句:“Nostrils high on the head would have permitted the dinosaurs to breath