Read the following paragraphs and answer the question.
But something unexpected happened. A patient who had been so depressed and could barely speak became ebullient after the 45-minute brain scan. Then a second patient, who seemed incapable of even a smile, emerged actually telling jokes. Then another and another. Was this some coincidence? Aimee Parow, the technician who made these observations (she is now a medical student in New York) didn’t think so. She mentioned the patients’ striking mood shifts to her boss, and together they completely refocused the study: to see if the electromagnetic fields might actually have a positive effect on depressive mood.
The word “ebullient” can be best replaced by（ ）.
A、
interested
B、
quiet
C、
excited
D、
sorrowful
【正确答案】：C
【题目解析】：
由第一句可知，“”出乎意料的事情发生了。在45分钟的脑扫描后，一个沮丧得几乎说不出话的病人变得兴奋起来。”ebullient此处意为excited“兴奋的”，故选C。A项interested“感兴趣的”；B项quiet“安静的”；D项sorrowful“悲哀的”。