(D) The first describes the circumstance that the argument as a whole seeks to explain; the second gives the explanation that the argument seeks to establish.
=> the argument as a whole is not seeking to explain the first boldface, namely several of a bank's top executives have been buying shares in their own bank
but instead is trying to refute the claim that rumors about impending financial collapse of the bank must be false.
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。
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CDE的and前面的逗号是不是表示平行对象位置的变换，虽然并没有改变句意但是应该是和前面的said之后的that平行了吧。D的句意应该也有很大的问题啊，后面的more widely available不是在修饰Internet connection了吗？