.

“Meals on wheels” is a free service, ____ hot meals are delivered to elderly people who may not be able to move around very easily.

A．that

B．which

C．where

D．what

溃疡性结肠炎结肠镜检查错误的是

A．呈大小深浅不同的溃疡

B．溃疡间黏膜正常

C．黏膜粗糙，轻触易出血

D．可有炎性息肉

E．活检呈非特异性炎性病变