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Re: For some time, scientists refused to believe that Earth’s
[#permalink]
02 Sep 2017, 19:34
Explanation
The first blank describes the thinking of scientists who refused to consider a process they can’t explain, so a word like rigid or limited would make sense. Of the choices, only dogmatic matches the meaning you need.
The second blank describes the result of such limited thinking on the advancement of science, so you need a word that means something like slowing or stopping. Of the choices, only checking fits the context.
Hence options C and D are correct!