第7题: [单项选择]射血分数指 A. 每搏量占心室舒张末期容积的百分比 B. 每搏量占回心血量的百分比 C. 心排血量与回心血量之比 D. 心排血量与心室收缩末期容积之比 参考答案:A
第8题: [单项选择]It is reported that thirty people were killed in a ______ on the railway yesterday. A. collision B. collaboration C. congestion D. confrontation 参考答案:A 答案解析:collision意为“碰撞,冲突”,例如:The liner is reported to have been in collision with an oil tanker. 据报道,这艘客轮与一