根据题意得：a+3≠0，解得：a≠-3．
故答案是：a≠-3．
-How long does it take you to get to school?
-______. [ ]
A.5 kilometers
B.Every day
C.By bike
D.Around an hour
控制废电池危害的根本措施是禁止______和_______危害性大的电池，大力开发_______的环保型电池。
