試題詳解

40.The author mentions outer space in the 1st paragraph because __________.
(A) the Earth's climate millions of years ago was similar to conditions in outer space.
(B) it is similar to the ocean floor in being alien to the human environment
(C) rock formations in outer space are similar to those found on the ocean floor
(D) techniques used by scientists to explore outer space were similar to those used in ocean exploration