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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这题关键在于把大句子的主语选对就好了。