A:①②
B:②④
C:①②④
D:①③④
— Everyone knows Canada is the second largest country in the world.— That is right. It is larger than ______ country in Asia.
在△ABC中,AB→+AC→=2AM→, AM→=1,点P在AM上且满足AP→=2PM→,则PA→·PB→+PC→等于( )
蝗虫、青蛙、袋鼠都有着发达的后肢,下列叙述与这一事实无关的是( )