GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - 002Y5S55Q0HTGM0WM

Scientists studied "gigantic assemblages of matter, extending across spans of millions and billions of light-years" in order to A. support a theory regarding the structure of galaxies B. discredit the view that effects of dark matter are only manifest over small distances C. bolster a hypothesis first proposed by Zwicky D. expand the scope of their findings E. observe a gravitational effect that is not apparent on a smaller scale