47. During the twentieth century, the study of the large-scale structure of the universe evolved from the theoretical to the practical; the field of physical cosmology was made possible because of both Einstein's theory of relativity and the better ability to observe extremely distant astronomical objects. A because of both Einstein's theory of relativity and B by both Einstein's theory of relativity and C by Einstein's theory of relativity and also D because of Einstein's theory of relativity and also E as a result of both Einstein's theory of relativity and -- by 会员 Sophia001 (2011/11/14 7:10:23)
选B吧... C和Dwordy排除 E改变句意排除 剩下A和B,感觉B更好一点.... |