GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - 777PDMOVQ14XYIPMJ

The passage implies which of the following about the "measurements" made by the astronomers? A. There were small calculation errors in their measurements. B. There were no large variations in their measurements. C. Their measurements were skewed by unevenly spread cosmic dust. D. Their measurements were incomplete because cosmos dust screened out some of the light. E. It was possible to take more measurements of red light than of blue light.