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举一反三
【多选题】The journey two divers(潜水员)made some time ago to the very deepest point on the earth make us realize how much of the world still remains to be studied. The two men went down seven miles to the bottom ...
A.
if there are water currents and life in the great depths
B.
if people can stand the severe cold in the great depths
C.
if there are steps in the great depths
D.
if the telephone works well in the great depths