单词填空首字母已给出
1.Thecityisthecentreofc____ofthecountry.
2.Inm____times,theenvironmentalpollutionhasbecomeaseriousproblemforhuman.
3.Ourstudentsneedtogetuesdtother____changingworldofnewtechnology.
4.Nowadaysagrowingn____ofpeoplethroughouttheworldarefondoflearningChinese.