第33题: [单项选择]Dozens of scientific groups ail over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules. A. pursuing B. chasing C. reaching D. winning 参考答案:A 答案解析:动词辨析。pursue意为“追赶、继续、从事”;chase意为“追赶、追逐”;reach意为“达到、延伸”;win意为“获胜、赢得”。pursue the goal of…意为“追求……的目标”,故答
第34题: [多项选择]二尖瓣狭窄有下列哪些心电图改变 A. 电轴<30° B. P波增宽有切迹 C. V1导联中P波双相 D. 左束支传导阻滞 参考答案:B,C 答案解析:[考点] 二尖瓣狭窄的心电图特点 [解析] 二尖瓣狭窄在心电图中的特点表现为标准导联P波增宽,V1导联中P波双向,负相增宽。