第3题: [单项选择]精索静脉曲张多见于左侧的原因,哪项应除外 A. 左侧的精索内静脉行程较长,并垂直进入左肾静脉,因而血流阻力较大 B. 左侧精索静脉受到前方乙状结肠压迫 C. 肠系膜上动脉和主动脉在搏动时压迫左肾内静脉回流 D. 精索内静脉周围的结缔组织薄弱,瓣膜功能不健全,左侧受影响尤为明显 E. 下尿路梗阻时,可发生左侧精索静脉曲张 参考答案:E
第5题: [单项选择]A. They are all attached to some public schools. B. They have the same rules with public schools. C. They are non-profit-making schools. D. They have more freedom to make decisions. 参考答案:D 答案解析:[解析] 26-29 Charter schools operate with public money but without many of the rules that gover