B:* "the intent that they will sell them later..." they 指代不清楚既可以解读为the companies也可以解读为those who XXX. * the "which" erroneously refers to "1999". 即使可以考虑跳跃修饰也不如直接把act 放在which 前面好， 是ACT allows
D : "when placed in a stimulating environment" - it sounds like they are referring only to the time that the mice are in the stimulating environment - but the brain growth is permanent. It doesn't shrink back down once the mice are no longer in the stimulating environment. They 指代有误 canaries' 是所有格无法被they 指代
in that choice, the presence of both "from" and "since" constitutes redundancy.
It starts with "when" and the word when refers to a time or date (in this case, a date. That date needs to be placed right before the "when." C, D, and E do not put that date right before the "when" (that is, at the end of the answer choice).
关于比较对象的问题：
i.e.,
americans in paris are happier than those in berlin.
--> there are 2 different sets of american expatriates -- one set in paris, the other in berlin. the former are happier than the latter.
americans are happier in paris than in berlin.
--> this sentence implies that the same people would be happier in paris than in berlin.
Ron: https://www.manhattanprep.com/gmat/forums/the-anasazi-settlements-at-chaco-canyon-were-built-t2236.html
analogy:
the USA comprises 50 states, each of which is united by a federal government --> wrong (the implication is that each state has its own federal government)
the USA comprises 50 states, all of which are united by a federal government --> correct
the USA comprises 50 states, (all) united by a federal government --> correct, whether you have 'all' or not
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B:* "the intent that they will sell them later..." they 指代不清楚既可以解读为the companies也可以解读为those who XXX. * the "which" erroneously refers to "1999". 即使可以考虑跳跃修饰也不如直接把act 放在which 前面好， 是ACT allows