单选题A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.Aperform the Heimlich maneuverBmake the victim lie down with the feet elevated to get blood to the brainCimmediately administer CPRDdo nothing until the victim becomes unconscious
单选题
A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
A
perform the Heimlich maneuver
B
make the victim lie down with the feet elevated to get blood to the brain
C
immediately administer CPR
D
do nothing until the victim becomes unconscious
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