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【单选题】In a purely biological sense, fear begins with the body’’s system for reacting to things that can harm us—the so-called fight-or-flight response. "An animal that can’’t detect danger can’’t stay alive...
A.
reactions of humans and animals to dangerous situations are often unpredictable
B.
memories of significant events enable people to control fear and distress
C.
people’’s unpleasant memories are derived from their feelings of fear
D.
the amygdala plays a vital part in human and animal responses to potential danger
【单选题】Sharpey纤维是指（）。
A.
一端埋在牙槽骨，一端埋入牙龈
B.
一端埋在牙槽骨，一端埋入牙骨质
C.
一端埋在牙槽骨，一端埋入牙周膜
D.
一端埋入牙骨质，一端埋入牙周膜
E.
一端埋入牙髓，一端埋入牙龈