Ron曾经说过， and 前后 两个句子，意味着这两个句子之间没有因果关系。比如 Today's traffic was so heavy and I was late for my work. 意思是，交通不畅跟我迟到没啥关系，两件事，并不能说明我迟到是因为堵车，也就是说这两件事之间是independent。 同理此题C，读起来感觉是两件事情。Spacecraft绕asteriod一年，靠近获取精确的度数，和科学家希望能更好理解太阳系没有任何关系。这个选项忽略了科学家希望依靠这些度数来更好理解太阳系的这个意思。所以A更好。 不要找完美的选项，而是找出比较好的选项。：）
-----------gmatonline
前文首先提出这个观点In addition, even when a single gene is found to control a behavior, researchers in different fields do not necessarily agree that it is a "behavioral gene." 然后分别阐述两类学者对behavioral gene的理解，接着举这个shaker的例子。Since shaking is not healthy, ethologists do not consider Shaker a behavioral gene.所以neuroscientists 肯定是不认同这个观点的
是ecologist的取反，看错了名词群体！
choice D
PROBLEM: The "up" is unnecessary. The present perfect tense starts in the past and continues into the present. But the use of "until recently" implies that this has stopped, so the present perfect doesn't work.
Remember that "recently", albeit not too long ago, is still a time in the past.
I think it is awkward to say" the production is expected that it will double..." when there is a more concise way to say" it is expected that the production will double..." The rule or explanation mentioned above is not 100% guaranteed...
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Ron曾经说过， and 前后 两个句子，意味着这两个句子之间没有因果关系。比如 Today's traffic was so heavy and I was late for my work. 意思是，交通不畅跟我迟到没啥关系，两件事，并不能说明我迟到是因为堵车，也就是说这两件事之间是independent。 同理此题C，读起来感觉是两件事情。Spacecraft绕asteriod一年，靠近获取精确的度数，和科学家希望能更好理解太阳系没有任何关系。这个选项忽略了科学家希望依靠这些度数来更好理解太阳系的这个意思。所以A更好。 不要找完美的选项，而是找出比较好的选项。：）
-----------gmatonline