Unit One Text:What Are Clones? …… Unit Two Text:Origins of Clock Watching …… Unit Three Text:Machine Translation …… Unit Four Text:Origin of Coal …… Unit Five Text:Sustainable Chemistry …… Unit Six Text:Resolving the Mystery of Galaxy Formation …… Unit Seven Text:Food Irradiation Moves Forward …… Unit Eight Text:Synesthesia …… Unit Nine Text:Telemedicine …… Unit Ten Text:What Can Be Done about Junk E-mail …… 练习参考答案 课文参考译文 Glossary · · · · · · (收起)