单选题 After a few months, the immigrants became ______to the new environment.
【正确答案】 D
【答案解析】[解析] confident确信的,有信心的;sick不舒服的,想吐的;happy高兴的;accustomed惯常的,习惯的。根据题意可知,此处应填“习惯的”。故答案为D。