农业是（），农产品是人类生存最必需、最基本的生活资料；农业国民经济基础作用的大小是由农业劳动生产率的高低来决定的。
参考答案：国民经济基础
Yu Bing: Hi, Mark! Have you watched the TV news this morning?
Mark: No. 小题1: ________________
Yu Bing: Flight (航班) MH370 from Malaysia (马来西亚) to China disappeared last night.
Mark: 小题2: ________________ How many passengers are there?
Yu Bing: 小题3: ________________ Many countries are now searching for MH370, and yet we have no idea what happened to it.
Mark: 小题4:________________
Yu Bing: We are looking forward to finding the missing flight earlier.
Mark: 小题5: ________________
简述“全人类彻底解放”的内容。
