(单选题)

Why have the two scientists have been awarded the Nobel Prize this year?

A.Because they discovered a type of bacterium.

B.Because they developed a tool for gene-editing.

C.Because they modified both DNA and RNA.

D.Because they were great women chemists.

参考答案：B

参考解析：

细节理解题。根据文章第一段第一句“Emmanuelle Charpentier and Jennifer A. Doudna have been awarded the 2020 Nobel Prize in two chemistry for developing the genetic scissors used in gene-editing”可知，艾曼纽尔·夏彭蒂埃和詹妮弗·杜娜因开发出用于基因编辑的基因剪子而获得2020年诺贝尔两项化学奖，这是两位女性首次分享这一奖项。故选B。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语