题目

 On May 10, 2013, Ma Yun resigned as CEO of Alibaba, and Lu Zhaoxiit over. A. took         B. handed           C. got          D. came 答案：A下列计算正确的是（　　） A、a4•a4=a16B、（a5）2=a7C、（2a）2=4a2D、a3÷a=a3