胆色素是体内的代谢废物，以下物质属于胆色素的是（）
A.胆固醇
B.胆汁酸
C.胆酸
D.胆红素和胆绿素
E.胆汁
参考答案：D
Charlie ______ here next month. [ ]
A. isn't working
B. doesn't working
C. isn't going to working
D. won't work
基因
