题目

The education of ______ young is always ______ hot and serious topic. A. /; /                                      B. the; a                     C. /; the                     D. the; / 答案：B9．下列关于人在寒冷环境中的生理变化，正确的是（　　）A．皮肤血管收缩B．体温大幅度下降C．皮肤血管舒张D．骨骼肌舒张