An analyst does research about revenue recognition. Which of the following criteria is not required for the recognition of revenue from the sale of goods under U. S. Generally Accepted Accounting Principles (U. S. GAAP) （）

A. There is evidence of an arrangement between buyer and seller.

B. The seller is reasonable sure of collecting money.

C. The amount of revenue can be measured reliably.

男性，50岁。胃溃疡病史10年，近2个月来上腹痛加重，疼痛失去节律，经多种药物治疗无效。查体：浅表淋巴结未触及肿大，腹平软，上腹部压痛，可触及包块

应首选下列哪项检查

A．粪便隐血试验

B．血清胃泌素测定

C．腹部B超检查

D．胃镜检查

E．钡剂造影