题目

In April, 2009, President Hu inspected the warships in Qingdao, ______ the 60th anniversary of the founding of the PLA Navy. A . marking B . marked C . having marked D . being marked 答案：A当人突然进入寒冷环境中时，相应的反应是（   ）A．温觉感受器兴奋，皮肤血流量减少B．酶活性降低，促甲状腺激素分泌减少C．皮肤血管舒张，汗腺分泌增加D．皮肤立毛肌收缩，甲状腺激素分泌增加