e.g., someone can help you to move across the country by, say, lending you a truck (or the money to rent one), or by setting you up with an apartment lease in the new location.

on the other hand, someone cannot help you move by doing any of those things.
the only way to help someone move is to physically assist them in hauling things, and/or to drive the moving van.

C makes it looks like surgeons are trying to do two things: plan difficult operations and develop programs. It also makes it look like doctors and nurses are similar to flight simulators.
NOT EXAMINED: the difference is that "help (person) (verb)" implies direct involvement, while "help (person) to (verb)" suggests a more indirect role.

as well as 不表示平行

DE的扭曲了意思，欧洲的书last longer是因为天气潮湿×
extremity：末端、尽头、四肢、极限...
extremes of temperature是很地道的用法, 词典例句: extremes of cold, wind, or rain

modifier: 加了个during就不认识which了= =

onset of sleep，A讲的是睡了很长一段时间，irrelevant

该句的重心应该是a cycle has begun

Many economics believe(这种开头后面往往会有反转？)...However...Clearly...找转折词！

crafters和句首的administrators相对应
看到句首的being就应该排除A、B项，对its/were这种代词/谓语的单复数还不够敏感！

being表示一个正在进行的动作，不能删掉

马克AWA素材...

小心C这个坑，怀疑这种推理题是不是一般都把正确答案藏在底下前面丢几个烟雾弹？

①看到样本平均数就要产生“有样本分布问题”的想法，如果样本分布不均匀，一大堆2、3小时和一大堆2、3分钟的，虽然平均数也是30min，这样还是需要限制做作业的时间，毕竟2、3小时很多
②In GMAT CRs any quatitative data, especially with adjectives such as \"generally\" , \"on average\" etc are always questionable

tense
arrangement vs a bouquet of roses was being arranged

The actual mistake in choice D is the word "arrangement". "Arrangement" doesn't refer to the process of arranging something; it refers to the arrangement that results from that process.
(Similarly, "as I was judging xxxx" makes sense. "During my judgment of xxxxx" doesn't, because a judgment is a conclusion, not the process of arriving at that conclusion.)

+1:B: In 35 years 表示将来，改变了句意；since releasing 是介词+分词结构，分词逻辑主语不对；
C: in the 35 years 如果表示一段时间，应该加past, last等等；since替代了after改变句子原意，release这个动作没持续到migrated开始
用完成时：“have/had done…since did”，没见过have/had done…since have/had been done 的结构出现过.

reveals not X but Y 这个用法非常奇怪！
字典上的例句都是类似“It is not a black one but a white one”(not but似乎和be动词更有cp感)

观点: 方案a有XX坏处
削弱: 不实施方案a还是有XX坏处

查了牛津词典, on the basis of后面应该加一个fact/situation等等, 这里用avoidance是不对的

I clean the kitchen floor if
only
because I've gotten into the habit. = I do the cleaning for no really good reason. I do not do the cleaning because the floor is necessarily dirty, for example. Maybe IF I do the cleaning, the real reason is ONLY/simply/just BECAUSE I'm in the habit of doing so, whether the floor is dirty or not.