第18题: [单项选择]The author implies that birds ______. A. move faster and have greater endurance than reptiles B. move slower and have less endurance than reptiles C. move faster and have greater endurance than dinosaurs D. move slower and have less endurance than dinosaurs 参考答案:A 答案解析:根据第三段最后一句话“Birds and mammals,because they are warm blooded,move more swiftly and have greater physic
第23题: [单项选择]Ⅳ度阴道痉挛时涉及以下肌群()。 A. 会阴部肌肉和提肛肌群 B. 骨盆肌群 C. 臀部肌肉 D. 双腿内收并极力后撤整个躯体 E. 以上都对 参考答案:E 答案解析:依照严重程度,阴道痉挛可分为四级。Ⅰ度痉挛,痉挛的发生仅限于会阴部肌肉和提肛肌群。Ⅱ度痉挛,痉挛并不仅局限于会阴部,而是扩展到整个骨盆的肌群。Ⅲ度痉挛,除上述肌肉痉挛外,臀部肌肉也发生不随意痉挛,使臀