面对日本帝国主义的侵略，中国各界民众的态度是(     )

选择正确读音填在横线上。

剥壳（bāo   bō） ____     剥削（bāo  bō）____

    Davidson Black was a____(Canada) doctor who organized the excavation that led to the discovery of the bones in the Zhoukoudian____(cave) near Beijing. He was a specialist in the study of bones____it was his ambition to find and identify bones of early humans. His university was aware____the significance of his work. At first they gave him ample time to do his research, but____(late) they realized he was prepared to pursue it regardless of his students' needs and his____(teach) career, so they forbade him ____(travel) there any more. It was his assistant, Pei Wenzhong____made the discovery of these primitive bones and____(sharpen) tools. Davidson Black knew that his success was almost ____(entire) due to his assistant's systematic hard work.

（2015•湖州）小明家有个木衣架，有一次放学回家，他把书包挂在衣架A处，衣架倒了下来．小明是个聪明的孩子，他分析了衣架倒下来的原因后，测量了如下的数据：书包质量5千克；木衣架质量3千克；圆底盘直径30厘米；其他数据如图．衣架受到重力的作用线经过圆底盘的圆心．

（1）请你通过计算，解释衣架倒下来的原因．

（2）为了防止衣架倒下来，小明提出了改进意见﹣﹣﹣﹣适当增大圆底盘直径．请你再说出一种其他方法．