—Where was the boy taken away by the UFO?

—Oh, it was in the lake ______ he was swimming.[ ]

A. that

B. where  

C. because

D. at which

1993SNA的经济资产的定义包含了所有的自然资产，这些自然资产可分为两部分，即（）。

A.有形资产和无形资产

B.产出性经济资产和非产出性经济资产

C.金融资产和非金融资产

D.可再生资产和不可再生资产