申请从事考古发掘的单位,取得考古发掘资质证书,应当具备下列哪些条件?()A.有3名以上取得考古发掘领队资格的人员B.有取得文物博物专业技术职务的人员C.有从事文物安全保卫
听力原文：W: Are you sure that we'll be safe?M: Take it easy．All the ski runs are carefully marked．And anything that might be erous, like a cliff or something, is enclosed by a fence.W: I'm still nervo...