試題詳解

9. People are harmed by noise pollution but don’t even realize it. Many don’t even know there are two kinds of silence in us. One is internal, a feeling of respect for life, which is at the level of the soul. The other is ________, the feeling when humans put themselves into a natural environment without modernity or intrusion by manmade sounds.
(A) inbound
(B) outbound
(C) extent
(D) external