[求助]-请教OG黄皮385页114题

aaasai

114
The authors' suggestion that "as much as 90 percent of the mass of the universe is not radiating at any wavelength with enough intensity to be detected on the Earth" (lines 39-42) would be most weakened if which of the following were discovered to be true?

(A)     Spiral galaxies are less common than types of galaxies that contain little nonluminous matter.  
(B)      Luminous and nonluminous matter are composed of the same basic elements.  
(C)      The bright nucleus of a typical spiral galaxy also contains some nonluminous matter.
(D)       The density of the observable universe is greater than most previous estimates have  
suggested.
(E)       Some galaxies do not rotate or rotate too slowly for their rotational velocity to be measured

搜了一下以前的帖子，我对于解释能够看懂，可提干提到的那句话"as much as 90 percent..."是什么意思呢？他提到的radiating 和波长云云和前文又有什么关系呢？有没有牛人帮我翻译一下题干那句话。谢谢