Evidence has been found through years of study______ children's early sleeping problem likely to

continue when they grow up. [ ]

A. why  

B. how

C. whether

D. that

湿邪致病缠绵难愈的主要原因是( )

A．湿性重浊，留滞于体内，病难速愈

B．湿性黏滞，不易祛除，病难速愈

C．湿邪损伤阳气，阳气受损，病难速愈

D．湿为阴邪，易阻遏气机，病难速愈

E．湿性趋下，易袭阴位，病难速愈