摘抄C. Correct. The author assumes that salmon benefit from their local adaptations, which
makes the dilution of those adaptations a lowering of the salmon's overall fitness.
句首的after long years of indifferent reception by the scientific community（被科学团体所不接受的）修饰的是划线部分的主语。在逻辑上，能被科学团体所不接受的只能是某种工作（Barbara McClintock‘s subtle work），不能是it/重要性/承认。
B选项：代词it是形式主语，还原为正常语序则有：
to remove and replace the discolored layer of varnish on the Mona Lisa is allowed.
这句话并没有说明remove和replace的逻辑主语是谁。在本句的逻辑上，这句话是restorers说的，自然应该是这些人去移除褪色的颜料，不能不指明remove和replace的逻辑主语。
RON的解释：
* "prescribing privileges" is better than "the privilege to prescribe / privilege of prescribing", especially if the latter is placed at the end of the underlined part (as it is in choice a). the problem with the wording in choices (a) and (d) is that it's ambiguous: "...the privilege of prescribing to ... psychologists" could be taken to mean that the prescriptions themselves are being written for psychologists.
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时态：现完对，一般现在错，因为我们只能说这些研究“到现在为止”引导了科学家们去做出什么结论。谁也不知道以后是不是科学家们又能想出什么别的辙来。