— What a clean and bright classroom, isn't it?

— Yes, it's always clean and bright because it             every day. [ ]

A. cleans

B. cleaned

C. is cleaned

D. was cleaned

表示热极津枯的舌象多为

A．苔黄干燥

B．苔灰而干

C．苔灰而润

D．苔黑燥裂

E．苔黑而润