题目

She’s tired of acting, and she _______ changing for a new job, but she hasn’t made up her mind yet. A. had considered            B. has been considering  C. considered               D. is going to consider   答案：B 小李讲了一个龟兔赛跑的故事：龟、免从同一地点出发，发令枪响后龟缓慢地向终点跑去，直至到达终点，兔自恃跑得快，让龟跑了一段时间后才开始跑，当它超过龟后便在路旁睡起觉来，醒来一看，龟已接近终点了，于是便奋力追去，但最终还是让龟先到达了终点，据此，我们可以将龟兔赛跑的运动过程用x－t图象来表示，在下图中正确的是 [　　] A． B． C． D．