Einstein’s Theory of Relativity is so ________that most of us can not understand it.

Einstein’s Theory of Relativity is so________ that most of us can not understand it.

Einstein’s Theory of Relativity is so________ that most of us can not understand it.

A．controversial       B．appropriate        C．abstract           D．ridiculous

Einstein’s Theory of Relativity is so ________that most of us can not understand it.

A．controversial                          B．abstract

C．appropriate                            D．universal

Einstein’s Theory of Relativity is so ________that most of us can not understand it.

1. A.
   controversial
2. B.
   abstract
3. C.
   appropriate
4. D.
   universal