问题
选择题
The origin of ____ life on earth is ____ question that interests astronomers.（原创）
A．the; the
B．\; a
C．\ ; the
D．the; a
答案
答案：B
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The origin of ____ life on earth is ____ question that interests astronomers.（原创）
A．the; the
B．\; a
C．\ ; the
D．the; a
答案：B