根据下列短文，回答第15题：Every woman dreams of receiving a huge priceless diamond.Now space scientists 21____ that they have discovered the largest diamond in the universe．But it’s well 22____ the reach of the most loves truck men because it\'s 50 light years away, to be 23____．
Measuring 2,500 miles across and weighing five million trillionpounds，the rock Was found on Valentine’ s Day 24____ in the core of a white dwarf star, and it has excited the 25____ world.
“It’s the mother of all diamonds，”said Travis Metcalfe，26____ led the team of researchers at the Harvard-Smithsonian Centre，“and you would need a jeweler’S loupe(专用放大镜)，the size of the Sun，to 27____ this diamond．”
The largest diamond 28____ on earth was the 3，106-carat(克拉)Cullinan．It Was cut 29____ nine major stones，including the 530-carat Star of Africa，now a part of the Crown Jewels．Diamonds were 30____ discovered in India more than 2,800 years ago．The Ancient Romans 31____ that the stones were broken pieces of stars that had 32____ to earth．In Ancient Egypt，diamonds were used in funerals. In the Middle Ages，men 33____ them to symbolize their courage and strength．The 34____ of giving them as presents dates from 1477，35____ Maximilian，the prince of Austria, gave a diamond ring to Mary of Burgundy．{TS}填入21处的最佳选项是（）。