we need to prethink an assumption before looking at the answer choice.
Tp prethink an assumption, we should criticize the argument.
is two group the same at the beginning?
2 Prethink assumption: two group is the same before the smoking.
now with this weapon, this assumption we come to the answer choice.
choice A said that the cause-effect relation can be revert. This is what we look for
in fact I do not read other choices.
the process of criticizing and prethinking an assumption which look like not relevant to OA is important because it bing us close to the OA.
the rule" cause -effect can be revert" only help us partly to realize the OA. the key to success is to criticize and prethink an assumption.
There are two tools here:
1. criticize and prethink
2. understand some rules in answer choices.
both tool is imporrtant. use of tool 2 is meaningless without the use of tool 1. only use of tool 2 make us a machines remembering rules and will never win. gmat like a logic reasoner, not a machines.
tool 2:including some rules such as: another cause, reverted cause and effeect relation, languag shift, and many others. all of these rules are easy to learn and remember . but the rules is only help a little while the prethink step is the key.
please, comment my process of doing cr. I plan to retake gmat soon
If anyone in this gmat forum is in England,Britain, pls, email to me, (firstname.lastname@example.org) . I have some questions and need your advise. Thank a lot.