题目

阅读理解Doyou like the woolly mammoths from the movie IceAge? Too bad they're extinct? Thanks to recent developments inbiotechnology, the stuff of science fiction may soon become a reality throughan attractive process called de-extinction, which aims to bring theextinct species back. The resurrected species are functionally equal to theoriginal extinct species, but they are not exact copies. Thereare three primary techniques of de-extinction. One of them is that scientistsdeliberately select existing species with similar characters to the extinctspecies to produce later generation. This is计算（32×3）6+22） 43-4×（1649）- 12-42×80.25-（-2013）0= ．