读下图，回答问题

①在图中标出地球的自转方向。

②填出图中字母表示的地理事物：海洋：A____；B_____；大洲：D_______。

③南美洲到南极洲的通道C 是_______海峡。 

④写出E 点的经纬度是_____，_____。

⑤当阳光直射赤道时，南极洲的昼夜长短情况是_____。

⑥南极地区的_____资源非常丰富，特别是___和_____的储量较大。

⑦南极考察队员可能遇到的危险有_____（填字母）

a．暴风雪迎面扑来，看不清路

b．积雪覆盖冰隙，随时都有可能吞没队员

c．整个南极洲上见不到任何人，无法求助

d．酷冷的严寒，给队员留下无情的冻伤

e．随时可能遇到老虎的袭击

f．可能得到因纽特人的帮助

A．abcdef

B．abd

C．bde

D．abdf

Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is (96) . It determines how the various results are computed by the product and presents this information in the form of a (97) and associated scenarios. The second is (98) , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is (99) , which determines the actions performed by or to each class or subclass and presents this information in the form of (100)

A．collaboration diagram

B．sequence diagram

C．use-case diagram

D．activity diagram