the wildlife officials的目的是通过keep the northern snakehead ’s population from growing来stop the northern snakeheads from eliminating rare native fish species，而目的并非单纯保护rare native fish species
D项：As indicated above, this choice expresses the primary purpose of the passage; that is, to explain why the nature of the mass at the center of our galaxy was not adequately understood.
E项：Although some of the evidence presented may cast doubt on one or more assumptions of a theory that was current when the passage was written, the passage itself is not primarily focused on identifying any such assumptions.
对应原文第二段末句：Editors can risk having a few of the less popular titles reviewed, but they must consider what will be newsworthy, advertised, and written about elsewhere.和第三段第二句：But editors feel some concern about what might endure, and therefore listen to literary experts.
c不对，c是都赞同的点，因为In fact, at the First All-Russian Women's Congress in 1908, most participants advocated maternity insurance and paid maternity leave, although the intense hostility between some socialists and bourgeois feminists at the Congress made it difficult for them to recognize these areas of agreement.这句话是用来进一步说明前面那句的
Comparable worth, on the other hand, takes as its premise that certain tasks in dissimilar jobs may require a similar amount of training, effort, and skill;
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the wildlife officials的目的是通过keep the northern snakehead ’s population from growing来stop the northern snakeheads from eliminating rare native fish species，而目的并非单纯保护rare native fish species