All the books in the list, _____otherwise stated, will be available.[ ]

A. as

B. if

C. although

D. unless

十二指肠球部溃疡的疼痛规律为（）

A．疼痛进食疼痛

B．疼痛进食缓解

C．进食疼痛疼痛

D．进食疼痛缓解

E．无一定规律