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This priority might also often lead them to be less vigilant in streamlining their services—eliminating duplication between departments, for instance.
提出duplication departments是为了举例说明如何less vigilant in streamlining service，也就是优化服务流程=提效率？
large body strikes =>low gravity
paradox:many basins have no low gravity.
scientists speculate:[early]moon elastic=> gravity compensation(no low gravity)
[later]moon stiff and cooler=> gravity compensation may not occur (low gravity)
C，answer the question of whether those traces still exist , presuming such life forms left fossil traces to begin with.
presuming(that), 表示假设某事发生，如果……，用法类似if，后面跟从句。它不是伴随状语，是个从属连词，跟的是句子，presuming本身没有逻辑主语。
同样用法的还包括providing (that)，provided (that)， assuming (that)
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看到考比较，就应该清晰前后应该对称。