第4题: [单项选择]Wolfgang's father told him he couldn't play the piano yet because ______. A. his sister was taking lessons B. he had to help his mother C. he was too small D. he had to wait for sister to finish practising 参考答案:C
第9题: [单项选择]关于右心室，描述错误的是（） A. 是心脏最靠前的部分 B. 室上嵴将室腔分为窦部和漏斗部两部分 C. 入口为二尖瓣 D. 出口为肺动脉瓣 E. 流出道又称动脉圆锥 参考答案:C 答案解析:右心室是心脏最靠前的部分，入口为三尖瓣，出口为肺动脉瓣，室腔底部被右房室口和肺动脉口占据，二者间的弓形隆起称室上嵴，室上嵴将室腔分为窦部（流入道）和漏斗部（流出道）两部分。漏斗部（流出道）又称动脉圆锥
