What is the new discovery about?

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问题 What is the new discovery about?
  
O type blood can be transfused safely into humans of any blood type without medical risk. The problem is that it’s not always readily available for those who desperately need blood. Now an international team of scientists believe they have found a way to convert A, B and AB blood types into O type, making it safe to transfusions. Professor Orson of Long University Hospital in Sweden is one of report’ s authors.
President Fidel Castro Ruz has not appeared in live broadcast since disappearing from the public eye last July after he underwent emergency and intestinal surgery. Since then he’ s only been seen in still photograph and a short prerecorded video clips shown in Cuban State Television and most of those have also included the Venezuela President Hugo Chavez. So it is no surprise that the keep-in leader would’ve chosen Chavez’ s Radio Program for his first live appearance in over 7 months.

选项 A、More than 7 months ago.
B、5 months ago.
C、Less than 3 months ago.

答案A

解析 由新闻最后一句可知,卡斯特罗上次出现在电视上直播中还是七个多月前。
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