第1题: [单项选择]风湿性心脏病二尖瓣狭窄致肺淤血,是由于 A. 右心室衰竭 B. 右心房衰竭 C. 左心室衰竭 D. 左心房衰竭 参考答案:D 答案解析:[考点] 风心病二尖瓣狭窄
[分析] 二尖瓣狭窄血流动力学障碍导致左心房压增高,左心房扩大、肺动脉高压与右心室扩大,所以肺淤血是由于左心房衰竭所致。
第24题: [单项选择]Australia began to assume its modern configuration by the Eocene Epoch, some 50 million years ago, when Antarctica broke away and drifted southward. A. status B. sphere C. shape D. situation 参考答案:C 答案解析:[解析] configuration意为“外形”。C项shape“外形”符合题意,如:A huge shape loomed up through the fog.(一个巨大的影像在雾中隐约出现。)其
第37题: [单项选择]He ______ with Smith at least four times in the past three years. A. has been seen to meet B. was seen to meet C. had been seen meeting D. is seen meeting 参考答案:A 答案解析:[解析] 当see为被动语态形式时,其后的不定式要加to。在由until(till,up to)now,up to the present, so far, in(for,over, during)t