The girl used to be shy, but is ______ getting active in group work and is more willing to express herself. A . gradually B . usually C . previously D . merely 答案:A读“某区域环境问题示意图”,图中环境问题的出现,主要违背了可持续发展的 ( ) A.共同性原则和持续性原则 B.持续性原则和公平性原则 C.公平性原则和共同性原则 D.公平性原则、共同性原则和持续性原则