川芎的气味为（）
A.气香，味苦、辛
B.气香，味甘、辣
C.香气浓郁，味苦、辛，稍麻舌，微回甜
D.气微，味苦，麻舌
E.气微，味淡
参考答案：C
Mr. Black is working ______ his project at home. [ ]
A. to
B. on
C. in
D. at
