Studies show that people are more ________ to suffer from back problems if they always sit

before computer screens for long hours.[ ]

A. likely

B. possible

C. probable

D. sure

关于消化性溃疡的治疗，正确的说法是

A．需长期应用粘膜保护剂以降低溃疡复发率

B．为降低复发率，需长期服用质子泵抑制剂

C．只要内镜证实溃疡已经愈合，溃疡就不会复发

D．根除幽门螺杆菌可以降低溃疡复发率

E．有消化道出血的溃疡患者必须长期治疗