DE:Idiomatic usage. In the phrase 'little of X', the X has to be a singular quantity. If it's plural (like 'differences'), then you have to use few.
There was very little food left over at the end of the party.
There were very few crab cakes left over at the end of the party

老师，为什么说C项是一个原因？这样的情况下，应该怎么分别假设和原因？
谢谢！

是因为even if 是即便的意思，although是虽然的意思么。。。这道题里用although好像也翻译的通？

even if 和although的区别是什么，although不也表示让步么？

D 和 E的主要语义差别，和如何选择很懵逼，求教。

A选项可以看成，urban的children不用给rural的老人钱了，所以导致经济增长吗

第二段中间有个However, 可知是观点的对比。从BE里面选，（当时脑子一抽看到P2开头写traditional以为就是新旧观点对比，看到B的关键字contrast, traditional就选了B）。事实上P1最后一句scientists' reconstructions of the animals' anatomy have had important implications for hypotheses concerning the development of the vertebrate skeleton.hypotheses就是P2提到的两种观点。全文的逻辑就是p1 的 discovery，p2两种观点，p1的discovery支持了观点2。 从来没有说是新旧对比！而是横向对比！

针对A，D:But such predation on a dominant or potentially dominant species occurs in systems that do as well as in systems that do not have species that play keystone roles.

Keystone status appears to depend on context, whether of particular geography or of such factors as community diversity (for example, a reduction in species diversity may thrust more of the remaining species into keystone roles) and length of species interaction (since newly arrived species in particular may dramatically affect ecosystems).

跟OG2017Q-PS-146很像

老师，我有点不太清楚这里“As criminal activity on the Internet becomes more and more sophisticated”的用法，as 在这里是做连词把 "as..."和“not only..."连接起来了么，后面没有 but 但是也可以和前面的”not only'连接起来?

已知xy = -6. y=-3直接能解x。粗心

C，n依然可能为负

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probably 和what is estimated as冗余；主动语态优于被动语态。

这里我有个小问题。为什么“在标题泄露一点 information"就会被 读完完整故事的reader当成不 clever 的标题？

没注意between flights...算完总时长还在想为什么没答案..

c感觉更合理啊

prohibit 为什么弱呢，我觉得禁止了disclose, 肯定控制了这个动作发生啊

有关A的翻译建议稍微调整下：至少有些选择简单工作并说自己公平的志愿者，会在别人也如此做的时候说这是不公平的。
加强了：一样的事，人们对自己的道德要求比对别人的低。