据测算，我国每天因土地沙漠化造成的经济损失为1.5亿元，若一年按365天计算，用科学记数法表示我国一年因土地沙漠化造成的经济损失为[ ]

A.5.475×10¹¹（元）

B.5.475×10¹⁰（元）

C.0.5475×10¹¹（元）

D.0.5475×10⁸（元）

Look at the tall building. It's our ______. We often have lunch in it. [ ]

A. library

B. teaching building

C. post office

D. restaurant