第13题: [单项选择]肾上腺素不具有下述哪一种作用 A. 使心肌收缩力增强 B. 使心率加快 C. 使内脏和皮肤血管收缩 D. 使骨骼肌血管舒张 E. 使组织液生成减少 参考答案:E 答案解析:题解:肾上腺素与心肌细胞上的β1 受体结合,使心脏活动增强;与血管平滑肌上的α受体结合,引起血管平滑肌收缩,血管收缩。与血管平滑肌上的β2受体结合引起血管平滑肌舒张,血管舒张,因腹腔脏器和皮肤血管α受
第19题: [单项选择]Which is the reason why Mrs. Manstey did not write her daughter A. She did not receive any letters from her daughter. B. It was difficult for her to write. C. California was far away from New York. D. They were separated so many years. 参考答案:B