单选题The rescuer can best provide an airtight seal during mouth-to-mouth resuscitation by pinching the victim’s nostrils and（）.Acupping a hand around the patient's mouthBkeeping the head elevatedCapplying his mouth tightly over the victim's mouthDholding the jaw down firmly
单选题
The rescuer can best provide an airtight seal during mouth-to-mouth resuscitation by pinching the victim’s nostrils and（）.
A
cupping a hand around the patient's mouth
B
keeping the head elevated
C
applying his mouth tightly over the victim's mouth
D
holding the jaw down firmly
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