题目

My parents always remind me to work hard at my lessons and I am forbidden to do_________except studying. A. something  B. anything     C. nothing      D. everything 答案：B下图为马的生活史，有关此图的叙述中正确的是①有丝分裂发生在Ⅰ→Ⅱ、Ⅳ→Ⅰ ②基因重组发生在Ⅲ→Ⅳ之间③基因突变可发生在Ⅰ→Ⅱ、Ⅱ→Ⅲ、Ⅳ→Ⅰ④Ⅳ为新个体发育的起点A．①②③ B．①③④ C．①④ D．②③④