【单选题】The word "specter" in the second paragraph probably means ______.
A.something that people worry about.
B.something that people know about.
C.something that people are aware of.
D.something that people are afraid of.
【单选题】The word "specter" in the second paragraph probably means ______.
A.something that people worry about.
B.something that people know about.
C.something that people are aware of.
D.something that people are afraid of.
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