— How long did it _____ the conductor to check the tickets this morning?

— Half an hour.[ ]

A. pay

B. cost

C. spent

D. take

读某区域板块示意图，回答第1—2题。

1、图中①、②、③、④段边界属于生长边界的有[ ]

A．①②③

B．②③④

C．①③④

D．①②④

2、图中a、b、c、d区所在板块属于唯一大洋板块的是[ ]

A．a

B．b

C．c

D．d