肺癌病人的术前护理指导中错误的是（）

A.术前2周戒烟

B.练习腹式深呼吸

C.保持口腔清洁

D.有龋齿不影响手术，可不处理

E.进食高热量、高蛋白、高维生素饮食

The experiment has ________ the possibility of the existence of any life on that planet, but it does not

mean there is no life on other planets.[ ]

A. found out  

B. pointed out

C. ruled out  

D. carried out