某药物现在人体血液的浓度为<img src="https://static.zxtiku.com/wangke/imgs/topic/0455194492d2c997c8e2b1708f04a5d1.jpg"/>，以后每小时比上一小时减少<img src="https://static.zxtiku.com/wangke/imgs/topic/dadcdae6b6385334413d4e79ffd55cc9.jpg"/>，问<img src="https://static.zxtiku.com/wangke/imgs/topic/6b85a66b732d401f84c7af952dbf9cde.jpg"/>（正整数）小时后该药物在人体血液的浓度为多少？<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/14757245e38d43df58369930ac29571e.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/71ab2c1350187e6dbeb9c5c55fbd3a1a.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/74cdfb967639022269b6f2faf0f5bc5f.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/2962f9fa536a186d584c06e217a83c54.jpg"/>