根据短文理解，选择正确答案。

    An absolute description of the threat hanging over the world's mammals,reptiles,amphibians and other life forms has been published by the well-known scientific journal,Nature.A special analysis carried out by the journal indicates that an astonishing 41% of all amphibians on the planet now face extinction while 26% of mammal species and 13% of birds are similarly threatened.

    Many species are already critically endangered and close to extinction,including the Sumatran elephant,Amur leopard and mountain gorilla.But also in danger of vanishing（消失）for the wild,it now appears,are animals that are currently rated as merely being endangered.

    In each case,the finger of blame points directly at human activities.The continuing spread of agriculture is destroying millions of hectares of wild habitats every year,leaving animals without homes,while the introduction of newly-come species,often helped by humans,is also damaging native populations.At the same time,pollution and overfishing are destroying ocean ecosystems.

    "Habitat destruction,pollution or overfishing either kill off wild creatures and plants or leaves them badly weakened," said Derek Tittensor,an ocean ecologist at the World Conservation Monitoring Centre in Cambridge. "The trouble is that in coming decades,the additional threat of worsening climate change will become more and more common and could then kill off these survivors."

    The problem,according to Nature,is worsened because of the huge gaps in scientists knowledge about the planet's biodiversity.Evaluations of the total number of species of animals and plants alive vary from 2 million to 50 million.In addition,evaluations of current rates of species' disappearances vary from 500 to 36,000 a year. "That is the real problem we face," added Tittensor. "The scale of uncertainty is huge."

    In the end,however,the data indicate that the world is heading cruelly towards a mass extinction-which is defined as one involving a loss of 75% of species or more.This could arrive in less than a hundred years or could take a thousand,depending on extinction rates.

甲:真对不起，踩了您的脚。

乙:没关系，难免的！

这组对话说明为人宽容就能（    ）

①人品德高尚                        ②是非不分，爱憎不明

③扬人之长，谅人之短        ④解人之难，补人之过

                                                                                           小树

    张三带着斧头在树林里走过，一棵小树拦住他，对他说道：“把这些树木砍个干净吧，好心肠的朋友，我希望你砍掉它们！它们不让我自由发展，太阳光照不到我的身上；伸展我的根子吧，我又根本找不到地方；我的四周没有一点儿风的声音，这些树木在我头顶上结成了一个地道的罗网。我告诉你吧，要不是它们挡着我，要是我能自由生长，一年之内你就可以看到我成为这地方的光荣和骄傲，我的友爱的树阴将要一直遮庇到山谷的左右两边。然而，现在的情况却是如此，你瞧！我是灌木——就这么点儿高。”

    于是张三挥动着他的斧头，为朋友帮忙。他的好心肠没半点儿犹豫，他在小树的四周，开辟出了整整齐齐的一块地方。

    可怜的小树！它的胜利并没有存在多久，起初是炎热晒干了它的汁液，接着是挨到了大雨和冰雹的打击，最后，一场可怕的风暴，把它的枝叶吹折打落了。

    “愚蠢的东西，”小树听见附近有一条蛇说道，“你的毁灭是你自己招来的。如果你在树林的慈爱的荫庇下多栽培些日子，那么，无论炎热也好，大风也好，都不可能这样地逼上门来：你有老树保护你的安全。如果到了那些树木因为寿命已经结束，统统消失了的时候，这就轮到你一年年地成长，长到它们那样的高大，那时候你已经日积月累地锻炼得健壮有力，就不会有今日种种的祸害发生了。即使是再厉害点儿的风暴，你也经得住，也可以安然无恙。”