哺乳类是目前动物界最高等的类群,下列各项中最能体现哺乳动物高等的是
My teacher promised to ______ my suggestions, so I gave him some ______.
如图,在等腰△ABC的两腰AB、BC上分别取点D和E,使DB=DE,此时恰有∠ADE=12∠ACB,则∠B的度数是____