发热患者下列哪项体征对诊断亚急性感染性心内膜炎最具有特征性A．进行性贫血 B．脾大

A:  小题1: Mike?
B: I’m reading a magazine about UFO.
A: Really?  小题2:
B: Well.  小题3: The universe(宇宙) is so big and three millions of stars in it. I think there must be some kinds of living creatures(生物) in the outer space. They may be clever than us.  小题4: Have you heard of the reports about the UFOs which flew over Beijing, Wuhan and Hangzhou recently(最近)？
A: Oh, yes. And I’ve also read some other reports about the UFOs.
B:  小题5:
A: Well, I can’t really agree with you.

A. What do you think of UFOs? B. What are you reading? C. They are trying to visit us. D. Do you believe there are real UFOs? E. Some of UFO stories may be true.