21. Why are sympathetic and parasympathetic nervous systems mentioned in the third paragraph?
(A) To
show how goblin mode is triggered.
(B) To explain how goblin mode helps to relax.
(C) To demonstrate
how they affect people’s moods.
(D) To explore how complicated nervous systems are.
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統計: A(7), B(17), C(8), D(0), E(0) #3108408
統計: A(7), B(17), C(8), D(0), E(0) #3108408