eg:Twenty percent of country is covered by islands 1 The mountain peaks was covered with snow.2为什么两个句子一个with一个by?

eg:Twenty percent of country is covered by islands 1 The mountain peaks was covered with snow.2为什么两个句子一个with一个by? the other twenty percent of the students和another twenty percent of the students有区别吗 This is ten percent luck ,Twenty percent skill ,Fifteen concentrated power of will 英语单词Percent用法Twenty percent of the students exercise for 4-6 times a week 中的percent为什么是单数. This is ten percent luck,　　Twenty percent skill 　　Fifteen percent concentrated power of will 　　Five percent pleasure,　　Fifty percent pain 　　And a hundred percent reason to remember the name! This is ten percent luck,Twenty percent skill,Fifteen percent concentrated power of will,Five percent pleasure,Fifty percent pain,And a hundred percent reason to remember the name什么意思? The output of the factory reduced by twenty percent.请翻译 用 twenty students day of percent more exercise hours the for two than a 造句 为什么 Twenty percent of country is covered by islands.为什么不是with? About twenty percent of population of our country live ___ wages.A.by B.for c.with D.in fifteen to twenty percent是啥 In the school,about twenty percent of the students __ from American nowA areB is C comesD canme This year the price of rice___about twenty percent.A.has raised by B.has been raised by This year the price of rice___about twenty percent.A.has raised by B.has been raised by in this area.over-----of the trees have been damaged in twenty the past twenty yearsA two thirds B 60 percents C 60 th percent 选什么 percent与percent of有何区别 percent与percent of有何区别 90 percent of 30