周恩来在十二三岁的时候就树立了“为中华之崛起而读书”的远大志向,并为之奋斗一生。可见( )
①远大的理想和目标是走向成功的第一步 ②把个人的发展与社会进步、祖国的命运结合起来,学习才有更大的动力
③学习的外在动机是推动我们学***动力 ④我们不是伟人,不必将祖国的强大作为我们学习奋斗的方向
某无色溶液中只可能含有①Na+ 、②Ba2 +、③Cl-、④Br-、⑤SO32-、⑥SO42-离子中的若干种(忽略水电离出的H+、OH-),依次进行下列实验,且每步所加试剂均过量,观察到的现象如下:
(1)用pH试纸检验,溶液的pH大于7(2)向溶液中滴加氯水,再加入CCl4振荡,静置CCl4层呈橙色(3)向所得水溶液中加入Ba(NO3)2溶液和稀HNO3有白色沉淀产生(4)过滤,向滤液中加入AgNO3溶液和稀HNO3有白色沉淀产生.下列结论正确的是
已知函数f(x)=aln(2x+1)+bx+1.
下列关于现代生物进化理论的叙述,错误的是( )
large and strong caught in the forest with a big net small and weak
didn't eat became good friends made a big hole
There was a lion and a mouse ____ . The lion is ____, and the mouse is ____. One day. The lion ____ the mouse. But he ____the mouse, he let the mouse go. The next day, two men caught the lion ____. And the mouse ____in the net and helped the lion get out. At last, they ____.