单选题 The scientific community was ______ when a living specimen of the coelacanth, long thought to be ______ was discovered by deep-sea fisherman.
A. perplexed... common B. overjoyed... dangerous
C. unconcerned... local D. astounded... extinct

【正确答案】 D

【答案解析】[解析] D选项：astounded的意思为“震惊的”，extinct的意思为“灭绝的”，如：I was astounded by its beauty．(它的美丽震撼了我。)句意：令科学界大为震惊的是，深海渔民发现了长期以来被认为已经灭绝的活腔棘鱼标本。故选D。
其他三项意思分别是：perplexed困惑的，common常见的；overjoyed欣喜若狂的，dangerous有危险的；unconcerned漠不关心的，local地方性的。