与肺癌发病关系最密切的因素是（）。

A.职业性致病因素

B.长期吸烟

C.免疫缺陷

D.慢性肺部疾病

E.遗传因素

　　　 the east coast of China, the city of Hangzhou is easy to be attacked by the storm from the Pacific Ocean.

A．Lying off

B．Situated on

C．Located off

D．Laying on