【正确答案】正确答案：Ladies and gentlemen, Following the ever-increasing communications between our university and other universities, we are having a great number of visitors from different universities. Today, we feel very much honored to have Doctor Brown as a visiting scholar to our university. Doctor Brown is well known to the world for his achievements in the field of medicine, and he has won a lot of honors as a medical scientist. On behalf of our university, I extend our welcome and cordial greetings to our distinguished guest from afar! Now let's invite Doctor Brown to give us a speech.

【答案解析】解析：这是一则欢迎致辞，正式。主要对宾客的到来表示感谢和欢迎，语言要充满热情。第一段介绍来宾的身份、成就等。第二段对来宾表示欢迎。第三段欢迎来宾作演讲。