∵a2+2a-12=（a+1）2-13，
∴当a=7-1时，原式=（7-1+1）2-13=7-13=-6．
故答案为：-6．
青春是美好的，青春更多的是梦想，是激情，是幸福。拥有青春，我们就可以[ ]
①每天都站在新的起跑线上，迎接新的挑战
②尽情放飞自己的梦想，并努力追寻
③不怕失败，相信一切可以从头再来
④放纵自己，无所顾忌地尽情享受生活
A．①②③
B．②③④
C．①③④
D．①②③④
A team, _____ two doctors and three policemen, ____ sent to search for the missing explorers.
A．consists of; was
B．consisting of; was
C．consisted of; was
D．to be consisted of; were
