()是应急救援工作的核心内容之一，其目的是为尽快地控制事故的发展，防止事故的蔓延和进一步扩大，从而最终控制住事故，并积极营救事故现场的受害人员。

A．人群疏散

B．伤员治疗

C．警戒与治安

D．消防和抢险

According to the speaker, what happened in the U.S. in the 1940s around the time of the Second World War that affected the popularity of the regionalist art()

A.The populations of small towns increased rapidly.

B.Art critics in cities began to take notice of regionalism.

C.Some regionalist painters began a new art movement.

D.Society became more internationally focused.