Perhaps he is not quite fit for the job, but           , please let him have a try. [ ]

A. in fact    

B. anyway    

C. so    

D. otherwise  

某地区居民多见甲状腺肥大，且该地区出现认知能力低下、呆小症、聋哑等症状的儿童，该地区居民有可能缺乏（）。

A.碘

B.硒

C.锌

D.钙

E.铁