请问：Again, differences between people and the opportunity for natural selection to take advantage of it have diminished.我查看很多参考书，这里it指differences 但是differences不是复数吗？
原文：And yet I am no freak of nature, nor of history. I was in the cards, other things having been equal (or unequal) eighty-five years ago. 请问老师，如何翻译这段话呢，第二句是否有虚拟语气呀？
We will strengthen ongoing and ex post oversight of
items for which approval has been cancelled or delegated to lower-level
authorities. 老师①这句话的for
which中的for是怎么出来的呢？②用of可以吗？为什么？
Transitions between stages could be marked with sabbatical as people
find time to rest and recharge their health,re-invest in their relationships,or
improve their skills.as 什么用法，求大神讲解!
...to find a person between the ages of 85 an 90 who primarily uses the left hand.Q: Seventy to ninety years ago, however, children were published for using their left hands to eat or to write and were forced to use their right hands.Q's response serves to counter any use by M of the evidence about...
It may issue detailed news releases amd find only small portions of them reported by the media；and media have the ability to be much more critical than a company would like.