“三防”设施齐全的人防工事不仅能有效防御空袭时的（），还能保障掩蔽人员对清洁空气和进出工事的要求。
参考答案：各种杀伤破坏因素
运动技术
Only one-fifth of Americans saw oil as the chief mason that the U.S. made a war on Iraq, but 75 percent of the French and of the Russians believed ______.
A. to B. so C. go D. do
