20世纪史学存在（）两种新路向。

She is the (6) of The Collaborative Lab, an innovation incubator(孵化器) that works with startups, big businesses and local governments to (7) innovative solutions based on the ideas of Collaborative Consumption. She has consulted to Fortune 500 companies and leading (8) organizations around the world on (9) and innovation (10) , and was a former director at the William J. Clinton Foundation. (6)

下列表述符合1787年美国宪法的是()。

民国初年,孙中山、袁世凯都做过临时大总统。后来成为第一任正式大总统的是()。

简述中国古代水利建筑类型。

“每一(签字国)政府各自保证对于各该政府作战的三国同盟成员国及其附从者使用其全部资源,不论军事的或经济的。”该内容出自()。