题目

Hoping to award her young son’s progress on the piano, a mother hopefully took her boy to a Paderewski concert. After they were 56  , gladly, the mother 57   a friend in the audience and walked down the aisle to 58   her. 59   the opportunity to explore the wonders of the concert hall, the little boy rose and 60   explored his way through a door with a sign 61   “NO ADMITTANCE”. When the house lights dimmed and the concert was about to 62, the mother said goodbye to her friend and returned to her seat, only to find that the child was 63. Suddenly, the curtains parted a 扬州的旅游宣传口号是“诗画瘦西湖，人文古扬州．给你宁静，还你活力”．为了了解广大市民对这一宣传口号的知晓率，应采用的调查方式为________(选填“普查”或“抽样调查”)．