Read the passage and mark the letter A, B,...

Câu hỏi: Read the passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. 

A. computer models are necessary for an understanding of gravitational science.

B. dark matter has little to no effect on the formation of certain cosmological phenomena.

C. the effect of Magellanic clouds on galaxies is enhanced by dark matter.

D. the shape of the Milky Way galaxy can be deduced by observing the matter surrounding it.