第17题: [单项选择]下列关于心肌收缩性的叙述不正确的是() A. 不受其他心输因素的影响 B. 与心肌顺应性无关 C. 与细胞内Ca2+浓度有关 D. 单位时间内心室压力的变化速度可反映心肌的收缩性 E. 心脏压力-容量环可作为反映心肌收缩性的指标 参考答案:B
第18题: [单项选择]Passage One
Questions 11 to 13 are based on the passage you have just heard.
A. Because he looks after their money. B. Because he pays for their clothes. C. Because he is important to them. D. Because he writes all the songs. 参考答案:C