第29题: [多项选择]右心衰竭的常见原因有() A. 肺栓塞 B. 法洛四联征 C. 二尖瓣狭窄 D. 二尖瓣关闭不全 E. 主动脉瓣关闭不全 参考答案:A, B, C
第30题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. She can’t decide which class to take. B. She’s having trouble getting to school. C. She has trouble finding a subject for an assignment. D. She can’t find the kind of paper she needs. 参考答案:C 答案解析:[听力原文]
M: Nancy, you look troubled.
W: I am having difficulty deciding on a topic for my history p