---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

港口在岸线分配时应遵循的原则为( )。

A．避免港池、航道闲置，充分利用

B．岸线够长，方便利用

C．深水深用，浅水浅用，避免干扰，各得其所

D．岸线布置科学、合理、最大限度地为市区居民服务