. ______________that no one wants to __________ it.

A．Such challenging is the task; take to

B．So challenging is the task; take on

C．How challenging is the task; take up

D．The task is such challenging; take in

患儿，2岁，有发热、声嘶、犬吠样咳嗽、吸气性喉喘鸣和吸气性呼吸困难等症状。首先应考虑的诊断是（）。

A.急性会厌炎

B.急性喉炎

C.气管支气管异物

D.喉白喉

E.喉痉挛