The elderly patients still prefer the traditional way, ______ online booking system is supposed to be convenient and fast.

A．while

B．though

C．unless

D．as

温疫恢复期的主要证型有：（）.

A.肠燥便秘

B.余邪留滞

C.肺胃阴伤

D.真阴耗损

E.脾胃呆滞