TODAY’S SCIENTISTS HAVE OVERCOME MANY OF THE CHALLENGES OF THE DEPTH BY USING MORESOPHISTICATED TOOLS

4/ - SACH BT ANH 10 CO DAP AN
SACH BT ANH 10 CO DAP AN

4/ Today’s scientists have overcome many of the challenges of the depth by using more

sophisticated tools.

A. passed B. run C. flown D. conquered