黏膜具有阻挡病原体的作用，呼吸道和消化道的黏膜还能分泌杀菌物质。它们属于特异性免疫。
—I'm going to the party on foot.
—If you do, you'll be ___________. The party will start soon.
综合题
INPUT x
IF x>1 OR x<-1 THEN
y=1
ELSE y=0
END IF
PRINE y
END.
