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【简答题】

祖冲之,429年生于建康(今南京),他从小就显示出过人的才学。他最伟大的贡献就是把圆周率的数值精确计算到 3.141,592,6和 3.141,592,7之间。这个数值在当时是世界上最精准的圆周率数值。直到大约一千年后,欧洲数学家才求得同样的结果。由于祖冲之在计算圆周率方面的重大贡献,圆周率又被称为“祖率”。国际科学界还将月球上的一座环形山(lunar crater)命名为“祖冲之山”(Tsu Chung-chi)。国际行星中心还以他的名字命名了一颗小行星(asteroid)。这些都是为了纪念这位伟大的科学巨匠。

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【单选题】Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...

A.
It is very unlikely, but the danger exists.,
B.
Such a collision might occur once every 25 years.
C.
Collisions of smaller asteroids with Earth occur more often than expected.
D.
It’s still too early to say whether such a collision might occur.