（）是爆破作业人员安全教育、法制教育和岗位技术培训的责任主体。
A．安全生产管理局
B．公安机关
C．中国工程爆破协会
D．爆破作业单位
参考答案：D
杜鹃（一种植物）与杜鹃鸟的细胞相比，杜鹃才有 等结构；如果按照从微观到宏观的顺序来描述，杜鹃的结构层次是： →杜鹃个体。
Here are the photos in Beijing. [ ]
A. who are taken
B. that took
C. which l was taken
D. that were taken
