Today is October 4th．It's World Animal Day．Gina  and her sister Sally go to the____early．They want to do some things for the____there．In the south of the zoo，Gina finds an elephant．Its____ are kind of dirty．Gina and Sally get some____and clean them．After that they get some food for this elephant．After the elephant eats the food，the two girls take a photo with it．Then they play with it．

    This elephant is____．It can draw．It can play soccer,too．Gina and Sally like it very much．Gina and Sally play with it for a long time．They have a great time in the zoo．

某种商品原售价200元，由于产品换代，现连续两次降价处理，按72元的售价销售．已知两次降价的百分率相同，若设降价的百分率为x，则可列出方程为____．

随着航天技术的飞速发展，我国已成功实现两次载人航天飞行，在火箭推动飞船上升阶段，下列说法正确的是（  ）

 st____ ____