Every boy and every girl as well as some teachers who ___ to visit the museum _____required to be at the bus station at 6:30.

A．are ; is

B．are ; are

C．is ; are

D．is ;is

男性患者，45岁，平素身体健康，近2个月出现上腹饱胀不适，偶有隐痛，伴纳差，近2天有黑粪，最有诊断意义的检查是()

A．腹部B超

B．粪便隐血试验

C．胃液分析

D．X线钡餐检查

E．胃镜+活检