About 70 percent of the population()in that country in the mountains and only 30 percent of its land () farmland.

A．lives; are

B．live; are

C．live; is

D．lives; is

患者，男性，40岁。间歇性上腹痛3年，近日出现呕吐，吐后自觉舒适，吐物有酸臭味。查：上腹饱满，有振水音，诊断可能为（）

A.消化性溃疡并幽门梗阻

B.十二指肠淤滞症

C.胃癌

D.急性胃炎

E.神经性呕吐