[单项选择]Which of the following was seen as a disadvantage of the postage stamp
A. It had to be purchased by the sender in advance. B. It increased the cost of mail delivery. C. It was difficult to affix to letters. D. It was easy to counterfeit.
第15题:[单项选择]<br><br><br/>A.when<br/>B.where<br/>C.that<br/>D.which<br/>参考答案:B 答案解析:[解析] The International Date Line指“国际日期变更线”，其后是一个定语从句，先行词在从句中做状语，故而选B。
第22题: [单项选择]有关慢性心力衰竭发病机制，下列哪项不妥( )。 A. 慢性心衰早期通过心率加快、心肌肥厚及心脏扩大可提高心排血量 B. 心衰早期神经内分泌系统激活，增加血管阻力，水钠潴留以维持血液灌注压 C. 失代偿期心肌肥厚致心肌损伤和坏死’ D. 失代偿时持续性心脏扩大，可加重心肌损伤 E. 失代偿期神经内分泌系统长期活性增加仍可维持血液灌注压 参考答案:E 答案解析:[知识点] 慢性心力衰竭的病因及发病机制
