30. —I _________ his telephone number.

—I have his number, but I _________ to bring my phone book.”

A．forget, forget

B．forgot, forgot

C．forgot, forget

D．forget, forgot

小儿佝偻病是哪种元素缺乏（ ）

A．铁

B．硒

C．锌

D．钙

E．碘