是ability has created a whole new class，不是to be able to adjust做主语

D错在哪里？for在这种情况下只能翻作因为而不能是为了是吗？那如果for不要，这个选项对吗？

没形成逻辑链儿

ABD、主谓一致错；主语是risks复数+谓语动词应该为复数
C、since the first jet transports went into service，OK
E、since the first jet transports [going into service，going…定语修饰transports，缺少谓语动词，句子不完整

10 were revised twice！

看错了！

考察不定式vs.从句的区别，不能用不定式短语来修饰名词system“系统去做”语意错，应改为定语从句
A、them无指代对象，逻辑上应该指代dinosaur单数；system to allow语意错
B、allow A + B--it指代dinosaur+ movement，“允许恐龙移动”允许一个移动；system to allow语意错
C、that引导宾从修饰system；allowed谓语动词 it宾语 to move comfortably宾补；it指代dinosaur；OK
DE、their无合理指代，同A

RON：when you have an INITIAL MODIFIER THAT'S NOT A CLAUSE (i.e., it doesn't have its own subject and verb), then it must modify the immediately following noun.
same problem in choice (e), which implies that lake baikal itself is somehow "more than all the North American Great Lakes combined". that doesn't make sense.

在CD中间犹豫了一下，还是错选，主要当时一瞬间闪过的想法是neither nor；现在知道如果前面是否定，也可以用nor

比较词lower than，比较对象必须在逻辑上和语法上对等
A、“是在一个更底的比率上”语意错
B、OK
C、同A
D、it was时态错，ever before应该用完成时
E、was，同E

A、平行触发语both...and...连接两者不平行introduction与to success；their无指代
B、its赘余
C、同A，不平行
D、OK
E、its赘余

Dendrochronology, the study of tree-ring records to glean information about the past, is possible because each year a tree adds a new layer of wood between the existing wood and the bark. 对文章整体的把握不够

1、second同位前面整个句子，前面已经说了向日葵是主要的商业作物，后面不用再讲这个第二指的是重要性上排第二
2、only second还是second only to soybeans？只排第二表示原本要排第一的，现在只排了第二，句子没有这个意思。排第二只在大豆的后面，only强调只在大豆这一个东西的后面。

count

A、ok
B、，修饰的句子必须用现在完成时，不能用进行时become
C、，banks make them harder…，make时态错误，同B
D、因为banks raised old fees and invented new ones，避免新费用变得越来越难，them指代new ones；逻辑错
E、同D

In arguing that this decline of feudalism was economically determined, the Marxist asserted that the Black Death was a relatively insignificant factor. 其实还是文章理解不到位；

这篇阅读难在对美国的历史不了解。。。跟那篇印第安飞地差不多

A、ok
B、，修饰的句子必须用现在完成时，不能用进行时become
C、C.，banks make them harder...时态错误，同B
D、因为banks raised old fees and invented new ones，避免新费用变得越来越难，them指代new ones；逻辑错
E、同D

zoologist Graham Twigg employs urban case studies suggesting that the rat population in Europe was both too sparse and insufficiently migratory to have spread plague. 真是奇怪，模拟的时候就看不到这句话，整理错题的时候就能看到了

C选项文中并没有提到Jaw和armor出现的时间关系呀，为什么在解答里把Jaw等同成了Teeth？