男性，48岁。原有十二指肠球部溃疡20余年，近2个月症状加剧，不仅餐前痛，餐后也痛，近半月常有呕吐，量大，为宿食，伴腐败味，胃镜检查见幽门梗阻，胃小弯有一2.5cm×2.5cm溃疡，中央深凹、表面覆污秽苔，边缘光整，质稍增加，活检时出血少，蠕动少，最可能的诊断是（）。

A.胃及十二指肠复合溃疡并幽门梗阻

B.胃癌加十二指肠球部溃疡合并幽门梗阻

C.胃溃疡合并真菌感染加十二指肠溃疡并幽门梗阻

D.胃溃疡加幽门梗阻

E.胃溃疡合并真菌感染加幽门梗阻

Questions from 31 to 35 are based on the following passage: Against this background, the WTO faces several daunting challenges. The first is to continue bringing down tariffs on traded goods. Average penalties have fallen steadily since the GATT’s formation but even the most open economies retain lofty barriers: for instance, America still charges a tariff of 14.6% on import of clothing, five times higher than its average levy.Resistance to tariff cuts is pest in agriculture. According to Tim Josling, a trade expert at Stanford University, tariffs and other barriers on farm goods average a crippling 40% worldwide and create distortions that “destroy huge amounts of value”. A new set of global farm talks is planned to start in 1999. At the least, you might think, these could lock in impressive reforms in Latin America and encourage further watering-down of the European Union’s Common Agricultural Policy. But they will prove difficult: squabbles over agriculture almost sank the Uruguay round.

The best title for the passage is（）.

A．NEW TRADE RULES

B．UNFAIR TRADE RULES

C．TRADE BARRIERS FOR DEVELOPING COUNTRIES

D．TARIFF CHALLENGES TO WTO