To save the drowning child, the boy plunged into the icy water without hesitation, ________ his own safety．
A.despite of
B.regardless of
C.unaware of
D.because of
网友回答
B解析本题考查介词词组的用法及区别。regardless of意思是“不管，不顾”；despite of“尽管”，表示让步；unaware of意思是“没有觉察到”；because of意思是“因为”，表示原因。