题目

国务院公布了《乳品质量安全监督管理条例》，确保乳制品的质量安全。这样做有利于 ①提高乳制品的产量                                              ②维护消费者的合法权益 ③实现乳制品的价值                                              ④更好地满足人们的生活需要 A．①②④                         B．①②③                  C．②③④                  D．①③④The sun heats the earth, ______ is very important to living things. [　　] A．thatB．what C．whichD．where