题目

After retirement, Mr. Smith ______ painting, which he had always loved but had not had time for. A. took up         B. got up        C. help up        D. looked up 答案：A 解析: 句意：退休后，史密斯先生开始绘画了，这是他从前喜爱，却又没有时间做的事情。take up: begin to spend time doing开始花时间从事（某项活动）；get up起床，起立;hold up推迟；look up查找、改善。1．在函数y=$\sqrt{x+2}$中，自变量x的取值范围是（　　）A．x≥2B．x≥-2C．x＞2D．x＞-2