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【单选题】
The oceans are about to be explored because______.A.
marine life has more medical value than land life
B.
human beings have the right to explore the nature
C.
they are unknown and mysterious to human being
D.
the exploration will bring great economic benefits
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举一反三
【单选题】The word impetus in paragraph 3 is closest in meaning to
A.
push
B.
style
C.
shock
D.
cost