Since teenagers have ____ ____these needs, they often question who they are and how they ____ ____ society.
下图所示的路线传播的是 ( )
在验证淀粉酶的专一性实验中,实验组的试管中加入3ml淀粉溶液和1ml淀粉酶溶液,振荡后置于60℃温水中保温。对照组的正确做法是( )