45 In order to improve the air quality in the room, it is important to regularly _________ by opening the windows and
allowing fresh air to circulate.
(A) ventilate
(B) penetrate
(C) perspire
(D) vocalize
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統計: A(88), B(47), C(49), D(13), E(0) #3342625
統計: A(88), B(47), C(49), D(13), E(0) #3342625