【題目】下圖示意我國(guó)南方某區(qū)域，T1、T2、T3為水平巖層，讀圖完成下列各題。

【1】

A. T1 T2 T3 B. T2T3T1

C. T3 T1 T2 D. T3T2T1

【2】

A. 斷裂下陷

B. 背斜頂部受外力的侵蝕作用

C. 流水的侵蝕作用

D. 冰川的侵蝕作用

【答案】

【1】A

【2】C

【解析】試題分析：

【1】讀圖，根據(jù)圖例可知，T1、T2 、T3都是沉積巖，沉積巖層下面的是老巖層，根據(jù)圖中的海拔高度判斷，T1海拔最低，在下面形成的早，T2居中，T3在最上面，形成最晚，所以圖中巖層從老到新的排列順序是T1、T2 、T3，A對(duì)。B、C、D錯(cuò)。

【2】讀圖，圖中巖層都是沉積巖，露出的水平巖層中間老兩翼新，說明是背斜構(gòu)造。山谷中有河流存在，說明河谷是受流水的侵蝕作用形成，C對(duì)。圖中巖層沒有斷裂下陷，A錯(cuò)。外力作用包括流水、風(fēng)力、冰川、海浪等的侵蝕作用，B錯(cuò)。南方地區(qū)沒有或很少冰川的侵蝕作用，D錯(cuò)。

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