—Yeah, it _____ us a whole year to finish the work.
A:took
B:has taken
C:takes
D:was taking
日全食来临之际,日食观测眼镜供不应求,南京紫金山天文台原本销售5元的观测眼镜卖到25元,但还是被抢购一空。这说明( )
计算下面图形的面积。(单位:cm)