设$f\left(x\right)=x^3+{\log }_2\left(x+\sqrt{x^2+1}\right)$，则对任意实数a,b,a+b$\ge$0是$f\left(a\right)+f\left(b\right)\ge 0$的（  ）

若图为东半球，则A点的经度是（　　）

选择合适的句子，补全对话。（有两项是多余的）

A:Hello, Liu Yun. ____ 

B:I visited Mike.

A:____ 

B:Because it was his birthday yesterday.

A:Did he have a birthday party?

B:____ 

A:____ 

B:There were fifteen children at the party.

A:Were Mike's parents at home?

B:____ 

____＜____＜____＜____