我觉得D,E中的定语从句也使用错误了，proven records 没有在从句中充当任何成分。

好难

截距是与坐标轴交点到原点的距离，应该是个绝对值，那么这里选择C是因为在这里的slope可以有多个解么，之前看OG问题是求value的时候是求唯一值。

看清楚having错在哪

此题还必须将具体数字算出来才能判断，陷阱呀( ⊙ o ⊙ )！大家注意(⊙o⊙)哦！！！

period 用in 比的是时间

each other 有包括自己another 是别人
in return for 换取什么 as a return on 投资回报

In B, the structure of noted... that the elephant, giving rides ..., had been earning falsely implies that the reader already knows about the elephant--that is, that the existence of this particular elephant is not new information. Also, the past perfect had been improperly places the elephant's earning in the past, prior to Wootton's; consistent verb tense is needed to show that the actions are simultaneous.

OG10:　　Choice A, the best answer, uses the idiomatic construction noted... that and clearly focuses on the salient information-- a comparison of annual earnings.

毕老师讲的好清楚

D直接指出Corp的问题，比B更直接

老师我想问a选项than 后面加has oil是什么用法

F是个16世纪英国探险家，从加拿大K岛拿回土壤样本检测金含量。因为测出金含量高，伊丽莎白一世资助了两个开矿队。两个开矿队都没有找到金子。K岛的土壤分析表明金含量低。因此用来测F样本金含量的方法不精确。 求假设即加强，等同取非求削弱--方法准，找一个选项让方法不准了。
A. K岛的金含量现在比16世纪低；测试方法就是16世纪的，跟现在含金量多少无关
B. 两个开矿队没有开采K岛的同一区域；无关，排
C. 用来测F样本的方法和16世纪其他方法不同；无关比较，排
D. F没有从其他岛上取样本来测金含量；其他岛，跳出范围，排
E. 在样本检测前金子没有被加入样本；取反即有金子加入样本，测出金含量高不能说明测量方法不精确，取反削弱结论，正确

注意这种结论是个否定句，求削弱的题目，都可以采用这种转换，变成肯定句求加强；选项里总会有几个选项故意反向坑你，我们努力消灭一切邪恶势力！

题干：SU获得了今年联系的潜在捐款人的80%的捐款。这个比例挺高的，但是跟（那些过去曾经捐过款的人）再捐款的预期比例是一致。所以看起来fund-raisers没有很努力去扩大捐款人的基数。因此80%这个很高的成功率，不能说明fund-raisers 干得好；求削弱；
题干有坑点，问法(不能说明活儿好->求削弱 ) 等同于 (说明活儿没干好->求削弱) 等同于 (取非求加强) , 即问找个选项能说明活儿干地好;
A暗指了SU募集人联络的是那些以前捐过款但是却没捐给SU的人, 符合题干的捐过款的人更容易再捐款,而这些人只不过过去没捐给SU,说明了SU募集人游说成功;

(c) is, as far as i can tell grammatically correct (although the commas are superfluous in such a construction), but it's simply absurd. the use of "or" here creates a sentence that is weirdly self-contradictory.
the clear point of the sentence is that the schools don't have enough computers, so you need to select the choice that's grammatically correct but also in line with that meaning. (d) is the only choice that satisfies both criteria.

选项A so that可以修饰动作,但不能修饰名词 ；排除AB
选项C would可表将来,而原句是已经知道的一个事实, would使用错误
选项D two-year low level不符合习惯用法,意思表达不清
选项E 正确 the July decrease in unemployment to the lowest level in two years suggests that the gradual improvement in the job market is continuing.

problem #2

"which is" is unnecessary and ugly.

if "which is" is followed by a description of something, you should just omit it, producing an appositive modifier:
X, which is a substance... (ugly) --> X, a substance... (better)
Person X, who is the coach of Team Y (ugly) --> Person X, the coach of Team Y (better)

(A) 价格上升禁止后，药商关注用新药代替现有品种；新药不受限制直接卖高价，导致处方药花费上升