slower/more slowly/less slowly填slower或more slowly意思是问 谁跑得更慢less slowly是问 谁跑得跟快 less slowly=fastermore happilyhappy本身是形容词 不像slow既可以做形容词也可作副词 所以要用它的副词形式修饰live 所以用happily而happily的比较及是more(less) happily.根据题意应该是more happily