46. What does the underlined bold word “vigilant” in the last paragraph most likely mean?
(A) Happy and friendly
(B) Careful and watchful
(C) Busy and distracted
(D) Young and energetic
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統計: A(2), B(30), C(2), D(6), E(0) #3492454
統計: A(2), B(30), C(2), D(6), E(0) #3492454