如下图所示，此时北半球的节气是（    ）

   I think the best place to go on Sunday is the zoo. When you are 1, you can go there with your family.  2 the zoo, there are many animals: elephants, deer , 3, rabbits and other animals. Elephants are the 4 animals on land. I 5 there is a baby elephant in our zoo. So I want to 6 at it. Yu Xuan wants to go with me. She says, " 7 we go there together?" "Sure!" I say. "We can 8 a good time there. But let's 9 there at half past four. I have 10 homework to do."

已知正三角形ABC的边长为1,点P是AB边上的动点,点Q是AC边上的动点,且$\overrightarrow{AP}=\lambda \overrightarrow{AB},\overrightarrow{AQ}=\left(1-\lambda \right)\overrightarrow{AC},\lambda \in R$,则$\overrightarrow{BQ}·\overrightarrow{CP}$的最大值为(  )