THE AUTHOR USES THE EXPRESSION "HAVE OPENED A WINDOW" TO INDICATE THAT THE USEOF OPTICAL FIBERS_____

Câu 37 (TH):

The author uses the expression "have opened a window" to indicate that the use

of optical fibers_____.

A.

has enabled scientists to make amazing discoveries

B.

sometimes requires a surgical incision

C.

allows doctors to see inside the body without major surgery

D.

has been unknown to the general public until quite recently