The confidence of the Chinese film makers ______ by Avatar, the release of______ has not only set a good example for the Chinese film industry but also embarrassed our directors, who lack professional ethics.

过点（，－2）的直线l经过圆x²＋y²－2y＝0的圆心，则直线l的倾斜角大小为（   ）

____在学习黎族人民纺织技术的基础上逐渐改进和提高了纺织技术。

水是人类宝贵的自然资源，黄河是我市主要的饮用水源。生活离不开水，净化水的知识在日常生活中有着广泛的应用。

These historic photographs show        Shang Hai's landmarks such as old downtown,People's Square and Hongqiao areas have developed over the past three decades.