英语选择并讲一下
问题描述：
英语选择并讲一下
It was marie curie who __redium and __ X-ray machines.
A.invented,discovered B.discovered,inveted
C.founded,invented D.discovered,found
答
B.discover：发现某种现象
find:找到某样东西
invent:某种发明（机器,设备）