What does OBLIVION mean here: "mere oblivion/Sans teeth, sans eyes, sans taste, sans
everything"?
O
A. to know
O
B. being aware of your surroundings
O
c. Unaware or forgetfulness
OD. beginning of story
O
D. beginning of story

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).