Which of the following underlined parts is different in pronunciation from others?

A．He acts as a killer in the film.

B．When did you arrive at the airport?

C．Can you help me fix the chair?

D．What did you think of the final exam?

学龄前儿童常见的营养问题有______。

A．缺铁性贫血

B．高血压

C．佝偻病

D．维生素A缺乏

E．糖尿病