患者女性，44岁。八年来劳累后心跳气短。既往曾患过"风湿性关节炎"。近日因劳累病情加重，心慌，气喘，咯血，不能平卧急诊入院。查体：慢性重病容半卧位，脉搏80次／分，血压13．3／9．33kPa（100／70mmHg），心向左侧扩大，心律完全不整，心率120次／分，心尖区舒张期雷鸣样杂音，主动脉瓣区收缩期和舒张期杂音，肝肋下3cm，下肢轻度浮肿。诊断：风湿性心脏病，二尖瓣狭窄，主动脉瓣狭窄及闭锁不全，心房纤颤，心动能不全Ⅱ度。该病人在用强心药治疗的过程中，心率突然减为50次／分。
该药物的主要作用是（）
A.激动多巴胺受体
B.激动α受体
C.激动β受体
D.激动M受体
E.激动N受体
参考答案：C
请仔细阅读以下五个段落，然后从A到F六个选项中选出和每个段落对应的内容。其中有一项多余。 请阅读以下五个人的信息，然后为他们选择最适合的一处地方： 小题1:Joe comes from Moscow. He has studied in Beijing for two years. So he misses his hometown very much. He hopes to go to a city where he can find the feeling of returning home. 小题2:Mary is an American girl. She likes going shopping. This year she’ll graduate from a famous Chinese college. So she is planning to travel to a city where she may find a job. 小题3:Henry is from Canada. He is interested in surfing and diving. But the city in which he is living is far from the sea. So he is expecting to get to a place where he can do these activities and taste bananas and pineapples. 小题4:Rosa comes from Britain. She cannot stand hot weather. And she thinks some Chinese cities have too much pollution. So she wants to go somewhere clean and peaceful. 小题5:Timmy comes from Japan. He has great interest in taking photos. He is looking forward to staying close to nature. He even wants to take a boat while taking photos. However, he doesn’t like hot food.
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