— _______, you can work out the math problem very easily.

— I see. Thank you very much, Miss Wang. [ ]

A. By the way

B. On the way

C. In this way

D. to the way

胃溃疡最主要的症状是（）

A．嗳气，反酸

B．恶心，呕吐

C．呕吐，黑便

D．上腹疼痛

E．食欲减迟