What are the important benefits of scanning？

What are the important benefits of scanning？
A.It can help you become a more flexible reader.
B.Scanning can cut your learning time in half.
C.It can also double your reading speeD.D.It can help you to research in a purposeful way.
正确答案：It can help you become a more flexible reader.Scanning can cut your learning time in half.It can also double your reading speed.It can help you to research in a purposeful way.