70.
									
										In cardiopulmonary resuscitation (CPR), the key objective of rescue breathing and chest compressions is to:
									
								
															
														
																									
										A:
											Clear a foreign-body obstruction in the airway of an unconscious victim. 
									
																										
										B:
											Oxygenate and circulate the blood in a victim whose heart has stopped beating.
									
																										
										C:
											Shock the heart of a victim of cardiac arrest so that a normal heart rhythm is resumed.
									
																										
										D:
											Provide artificial ventilation for a victim who is in severe respiratory distress.
									
																								 
							
																
									The answer is:
										B
									
								
														
							
								
								
							
							
							
								