__________ the reason , research shows that laughter is good for your health.A.WhateverB.WheneverC.WhicheverD.However
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A解析试题分析：根据句意：研究人员发现，不管什么原因，笑都有利于你的健康。Whatever无论什么 whenever无论何时 whichever无论哪一个 however无论怎样故选A考点：词义辨析
点评：whatever = no matter what .whichever同理，需要注意的是whatever既可引导名词性从句在句中充当成分，又可引导让步状语从句，而no matter what只可引导让步状语从句。