Question

__________ the reason , research shows that laughter is good for your health.

A．Whatever

B．Whenever

C．Whichever

D．However

Answer 1

A

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
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。