A:向燃料煤中加入生石灰,可以减少对大气的污染
B:用双氧水清洗伤口,可以杀菌消毒
C:只用淀粉溶液就能检验出食盐中是否加碘
D:随意丢弃废旧电池,会对环境造成污染
Our English teacher often tells us that success needs a lot of _______.