[单项选择]不用血管扩张药治疗的心排血量减少是()。 A. 缩窄性心包炎 B. 主动脉瓣关闭不全 C. 二尖瓣关闭不全 D. 高血压性心脏病 E. 充血性心脏病
参考答案:A 答案解析:缩窄性心包炎主要用加快心率来增加心排血量。
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第1题: [单项选择]According to the passage, the credit card enables its owner to ______. A. withdraw as much money from the bank as he wishes B. obtain more convenient services than order people do C. enjoy greater trust from the storekeeper D. cash money where he wishes to 参考答案:B 答案解析:[解析] 主旨题。此题答案是第一段中心思想,答案根据第一段第二、三句推知。