#announce+从句可以不加that！！#
A中时态错误
B时态错误，account for意思相反
D idiom错误，应该是announce +(that)+Clause/announce+noun/announce sth to sb/announce to sb sth.
E 时态错误，having done累赘

Δ的计算要两边同时计算

1) date….to 可追溯sth到...几年，强调发生的时间点，后面是ago

2) date….at 年代判定、鉴别/年份有….年之久，强调发生到现在经过的时间有多长，后面是old

date back: have its origin ——eg. burial sites dating back 5000 years

date from: to reckon from some point in time——eg.images date from the time of the Kushan empire

Take away：英语语法规定，当谓语动词的意思是“建议、命令、要求”时，由于身后的从句中的谓语动词必须用原型（通常需要省略should）。
Split#1：选项B中 were doing 时态错误，去掉。选项D中，for不对，应该为as，去掉。
Split#2：选项A和E对比，E用了倒装，没必要，去掉选项E
Split#3：选项对比，一个reform prisoners一个reform them，指代不清，去掉选项A

(1) Digging in sediments in northern China, scientists have gathered evidence suggesting that complex life-forms emerged much earlier than previously thought.
(2) A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.
(3) Even though more money was removed out of stock funds in July than in any other month since October 1987, sales of fund shares in July were not as low as what an industry trade group had previously estimated.
感受一波

注意fif的话必须要大一些

1) 下划线最后剩了televised nationwide, 提示观察划线与其是否搭配。C/E中in the hearings on the impeachment of President Richard Nixon, which中，which如果是was修饰的是impeachment而不是hearings，impeachment作为legal procedure不能被televised。
2) 观察选项发现有was/were的区别。A中是倒装句，was主语为she没问题，但后面it was中it指hearings错误、was错误，E中hearings应该是which were
3）then与later不能重复用
4）D中的comma+V-ing不能作impeachment的定语，是整个句子的adverb modifier

没有理解意思，以为社会现象与身体反应相冲突。
注意理清关系！！！

Split#1：主谓一致，排除选项B、D、E
Split#1：根据语义，排除选项C

bottom line都考……

注意做好假设

decimate 大批量杀害；倒装语句

E: 没有可以平行于those charging的结构，这里是比较charge的内容

A: we want different tenses, because one of these things is something that's permanently true (it makes burrowing difficult) while the other represents only the potential that something could happen (it could cause tunnels to collapse).

this simpler sentence, with the same construction, should be easier to understand:
Frank is extremely angry and could start yelling or punching the wall at any moment.

D: as...as to - no such structure; so...as to - the right structure

BCD, although表示“尽管”，不符合原句要表达的语义逻辑

B: at a cost raising.. raising的时态adopt主句的时态has proposed, 不符合逻辑, 应该用will raise表示将来

因为到现在为止，这些北极的冰并没有在夏天融化(little polar ice melts during the summer)，而水位上升是冰都融化之后才产生的，因此，冰融化这件事本身是一个与现实相反的状态，必须用虚拟语气were it to do so，不能只用otherwise

除了该用最高级以外，more+adj+n本来就是一个会引起歧义的说法
比如offer more dramatic evidence, 到底是更dramatic的evidence还是更多的dramatic evidence呢？

H比A更常见，95%得了A的人都得了H，首先排除A/B，C无法判断。
D肯定错，因为患H的人比患A的多，只知道患A群体的比例情况，不知道H群体的情况。
E：患H的人肯定比患A的人多，而同时患A+H的是A的95%，那么在H群体中，这个数字肯定会更小，因为分母变大了

既然是打消了initial doubts，那么定位肯定是在第一段与Africa有关的内容
E的enough to rise to the upper...错了，原文最后一句是to push Africa...