慢性萎缩性胃炎患者,有低酸,胃黏膜活检示重度不典型增生,表示()。
A.癌前病变
B.早期癌
C.萎缩性胃炎稳定期
D.萎缩性胃炎活动期
E.以上都不是
参考答案:A
Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study.
A.have helped
B.helped
C.help
D.helps
简述成本性态的重要性。