试题要求：
Dog trainers usually train their dogs first to_____.
试题解析：
答案：D
解析：
细节理解题。
定位到文中第三段的第一句，“Training your dog to “sit” is probably the first thing you will train your dog to do.”，训练你的狗“坐”可能是第一件你将要进行训练的事情，故选D。
考点：阅读选择,2017.4
Dog trainers usually train their dogs first to_____.
细节理解题。
定位到文中第三段的第一句，“Training your dog to “sit” is probably the first thing you will train your dog to do.”，训练你的狗“坐”可能是第一件你将要进行训练的事情，故选D。