共用题干
The Arctic Ice is ThawingFather Christmas may have to move his"workshop"from the North Pole because global warming is thawing the ice beneath his feet and his reindeers' feet as well.His"workshop"is in dire straits. The"platform"for the"workshop"is
共用题干
Cell Phone Lets Your Secret OutYour cell phone holds secrets about you.Besides the names and________(51)that you'ye pro- grammed into it,traces of your DNA linger on the device,according to a new study.DNA is genetic material that_________(52)in eve