单项选择题 下列哪种情况合并心房纤颤最易发生脑栓塞（）

单项选择题 根据下列文章,请回答 36～40 题。 First Aid First aid is emergency care for a victim ofsudden illness or injury until more skillful medical treatment is available．Itmay save a life or improve certain vital signs including pulse，temperature。aclear airway(气道)，and breathin9．In minor emergencies。First aid may prevent a victim'scondition from turning worse and provide relief from pain．First aid must beadministered as quickly as possible．In the case of the critically injured，a fewminutes can make the difference between complete recovery and loss of life．First-aid measures depend upon a victim'sneeds and the provider's Level of knowledge and skill．Knowing what not to do inan emergency is as important as knowingwhatto do．Improperly moving a person with a neck injury, for example。can lead to permanentspinal(脊柱的)injury and paralysis(瘫痪)．Despite the variety of injuries possible，severalprinciples of first aid apply to all emergencies．The first step is to call forprofessional medical help．The victim，if conscious。should be reassured that medicalaid has been requested，and asked for permission to provide any first aid．Next，assessthe scene，asking other people or the injured person's family or Mends aboutdetails of the injury or illness，any care that may have already been given，andpreexisting conditions such as diabetes(糖尿病)or heart trouble．The victim shouldbe checked for a medical bracelet(手镯)or card that describes special medicalconditions．Unless the accident scene becomes unsafe or the victim may sufferfurther injury, do not move the victim．First aid requires rapid assessment ofvictims to determine whether life threatening conditions exist．one method forevaluating a victim's condition is known by the acronym(首字母缩写词)ABC，which standsfor：A-Airway：is it open and clear7．B-Breathing：Is the person breathing? Look，listen，andfeel for breathing．C-Circulation：Is there a pulse? Is theperson bleeding externally? Check skin color and temperature for additionalindications of circulation problems． 第 36 题 First aid may bring about all the following results ExceptA．saving a victim's life．B．preventing a victim's condition fromgetting worse．C．helping a person avoid sudden illness orinjury．D．relieving a victim from pain．

填空题 在一个群体中，D→d的突变率为4×10-6。如果现在p=0．8，那么50000代之后的p值将是多少？（）