---What attracts people to California is its pleasant climate and relaxed lifestyle.

---This is ___ each year a great number of people from all over the world try to ___ to California.

A．how; immigrate

B．Why; immigrate

C．because; remove

D．why; remove

公元前4世纪，亚历山大出兵东征，足迹远达印度，建立起地跨欧美的大帝国。