我来到北京大学教书,完全是意想不到的幸运。 It has been an unexpected piece of luck for me ____. 该比例在所有核国家中居第30位,几乎是最低的。 ____, ranking 30th among all nuclear powers. 现在农村和山区的儿童可以与沿海城市的儿童一样上音乐和绘画课。 Children in rural and mountainous areas now can take music and painting classes, ____. 一些为接受更好教育而转往城市上学的学生如今又回到了本地农村学校就读。 Those students ____now are moving back to their local rural schools. 因其数量极少,大熊猫已被列为濒危物种。 The giant panda has been listed as an endangered species ____.