定义在R上的函数f（x）满足f（x）= $\{\begin{array}{c}lo{g}_2\left(8-x\right)，x\le 0\\ f\left(x-1\right)，x>0\end{array}$ 则f（3）=（   ）

在学习了液体压强以后，李铭同学分别向两个完全相同的甲、乙烧杯中加入等质量的煤油和水，并向甲、乙两烧杯中各投入一枚完全相同的实心小棋子，且两枚小棋子均沉入烧杯底．已知煤油的密度为0.8g/cm³，水的密度为1g/cm³，则两个烧杯中液面较高的为____（选填“甲”或“乙”）烧杯；若使两个烧杯中的液体变为同一高度，则小棋子在甲烧杯底中所受的压强p_甲____（选填“大于”、“小于”或“等于”）小棋子在乙烧杯底所受的压强p_乙．

阅读理解

    The lion says that he is________So he asks all the animals to come and listen to his last wishes.

    The cat comes to the lion's cave(洞穴). He stands there and goes in. Then a sheep goes in. Before she comes out, a rabbit goes in to hear the last wishes of the king of animals.

    But soon the lion looks well again, and goes out of his cave. He sees a fox(狐狸) waiting outside. “Why don't you come in?” asks the lion to the fox.

    “I beg your pardon,” says the fox, “I see many animals go into your cave, but nobody comes out. Before they come out again, I will wait outside.”

用计算器计算

(36870＋12990)÷831=____

云南省普洱市思茅区云仙乡大芦山彝族青菜节、思茅港镇傣族泼水节、倚象镇云盘山苗族花山节等民族节日各具特色，庆祝这些民族节日(　　)

①可以集中展示民族文化

②能够集中表达民族情感

③是书写中华民族文化的基本载体

④是展示民族文化成就的标志