【单选题】
Measuring 2,500 miles across and weighing five million trillion trillion pounds, the rock was found on Valentine’sDay{{U}} 24 {{/U}}in the core of a white dwarf star, and it has excited the{{U}} 25 {{/U}}worlD、
"It’s the mother of all diamonds, "said Travis Metcalfe,{{U}} 26 {{/U}}led the team of researchers at the Harvard-SmithsonianCentre ," and you would need a jeweler’s loupe(用专放大镜), the size of the Sun, to{{U}} 27 {{/U}}this diamonD、"
The largest diamond{{U}} 28 {{/U}}on earth was the 3,106-carat(克拉)Cullinan. It was cut{{U}} 29 {{/U}}nine major stones, including the 530-carat Star ofAfrica, now a part of theCrown Jewels.Diamonds were{{U}} 30 {{/U}}discovered in India more than 2,800 years ago. TheAncient Romans{{U}} 31 {{/U}}that the stones were broken pieces of stars that had{{U}} 32 {{/U}}to earth. InAncientEgypt, diamonds were used in funerals. In the MiddleAges, men{{U}} 33 {{/U}}them to symbolize their courage and strength. The{{U}} 34 {{/U}}of giving them as presents dates from 1477,{{U}} 35 {{/U}}Maximilian, the prince ofAustria, gave a diamond ring to Mary ofBurgundy.
B、certain
C．clear
D．correct
网考网参考答案：A
网考网解析：
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