It is a great        to know that no one got injured in this traffic accident.  [ ]

A. comfort

B. safety

C. shelter

D. rest

某同学用天平和量筒测金属块的密度金属块的质量如图甲所示，测量金属块体积时量筒中液面的示数如图乙、丙所示由此可知，金属块的质量为_______g，金属块的体积为_______cm³，金属块的密度为_____kg/m³。