The Dow Jones Industrial Average accounts for stock splits by:（）

A. multiplying the index by the stock split ratio.

B. reducing the market capitalization of the stock experiencing the split.

C. increasing the weighting of the stock experiencing the split.

男性，38岁，呕咖啡样物500ml，黑便2次伴晕厥入院，既往有十二指肠球部溃疡史。

查体：贫血貌，皮肤巩膜无黄染，心肺正常，腹部软，剑突下及右上腹轻压痛，肝脾肋下未触及。最可能的出血原因是（）

A.消化性溃疡

B.急性胃粘膜病变

C.贲门粘膜撕裂症

D.胃癌

E.食管胃底静脉曲张破裂