第12题: [单项选择]肝硬化腹壁静脉曲张,静脉血流回流方向为()。 A. 脐上腹壁静脉血流向上回流,脐下的静脉向下回流 B. 脐上腹壁静脉血流向上回流,脐下的静脉向上回流 C. 脐上腹壁静脉血流向下回流,脐下的静脉向下回流 D. 脐上腹壁静脉血流向下回流,脐下的静脉向上回流 E. 脐上腹壁静脉血流向左右回流,脐下的静脉向上回流 参考答案:A 答案解析:正常的腹壁静脉回流方向应为脐上的血管血流向上,脐下的流向下,最终分别汇入上腔静脉及下腔静脉。在肝硬化时由于门静脉高压,故产生腹壁静脉曲张,但由于门静脉及腔静脉并无梗阻存在,所以血流回流方向仍为正常,即
第22题: [单项选择]Passage One A. Parents’ support and loan for the students. B. The declining opportunities for the qualified people. C. The growing need for highly qualified people. D. The growth in the total numbers of old people. 参考答案:C 答案解析:[解析] What’s the reason for the rise in student numbers in the 1970s