封面胶在（）制作中起到密封和保护，并使甲面持久亮泽的作用。
A、全贴片甲
B、丝绸甲
C、光效凝胶甲
D、半贴片甲
参考答案：C
The old father ______ the project ten years ago but didn’t live long enough to complete it so
his sons and daughters ______ and are continuing doing it now.
A．came up; picked it up
B．put up; kept it up
C．took up; took it up
D．set up; brought it up
为什么生产、经营、运输、储存、使用危险物品或者处置废弃危险物品要审批和规范管理？
