Which of the following underlined part is different in pronunciation with others?

A．Look at the yellow duck.

B．Please open the window.

C．How do you do?

D．Follow me, please

安检人员要确立敬业奉献意识，必须正确对待三个考验（）。

A.是严峻的空防形势考验

C.是个人利益得失的考验

B.是繁重风险的岗位考验

D.是个人的心理素质考验