题目内容
（请给出正确答案）
[主观题]
The author mentions outer space in the first paragraph because______.A．the Earth's climate
The author mentions outer space in the first 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
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