Last year, Li Hua, a college student, _____ to work for the Olympic Games. [ ]

A. is chossing

B. is chosen

C. was choosing

D. was chosen

下列实验现象描述不正确的是[ ]

A.白磷自燃产生大量的白烟

B.硫在空气中燃烧，产生淡蓝色火焰

C.细铁丝在氧气中剧烈燃烧，火星四射，生成黑色固体

D.电解水时正极产生的气体比负极产生的气体多