Scientistsaretryingt的精選

問題詳情：閱讀下面短文，然後根據要求答題：ScientistsaretryingtoturndesertsintogoodlandagainTheywanttobringwatertothedeserts.Sopeoplecan liveand(A)        foodtherever,moreandmorelandisbecomingdeser...