由于密度不同，如图所示液体会分成三层，将体积不同，质量相同的A、B小球放入其中，静止后A球漂浮在油面上受的浮力为F_A，B球悬浮在糖浆中所受浮力为F_B，则（　　）

（2015•广东佛山）阅读下面短文，用所给单词的恰当形式填空，使短文通顺、合理。每词限用一次，有一个多余的选项。

                                    information   find   if   million   serve   try   whether   power

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下图是我国四个省级行政区轮廓图，读图，下列四个省级行政区分布是（   ）

已知集合$M=\{-1,1\},N=\left\{x\right|\frac{1}{2}<2^{x+1}<4,x\in Z\}$则$M\cap N=\left(\right)$

读下列材料，回答问题。

“上古穴居而野处,后世圣人之宫室,上栋下宇，以待风雨。”——《周易》

原文大意：上古时代，人们住在野外的山洞里。后来圣人建造房屋，改变了居住环境人们住进去躲避风雨。

分析回答: