当接触铅作业人员处于急性铅中毒期时，主要应该提供何种膳食（）

A.多钙少磷的成碱性食品

B.低钙多磷的酸性食品

C.正常膳食

D.高钙高磷膳食

E.成酸性食品和成碱性食品的交替使用

Look! There ________ some apples in that tree. [ ]

A. is

B. was

C. are

D. were