阅读理解A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid ) fingerprinting in criminal investigations. DNA fingerprinting was introduced in 19
阅读理解A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid ) fingerprinting in criminal investigations. DNA fingerprinting was introduced in 19
阅读理解Computers monitor everything in Singapore from soil composition to location of manholes. At the airport, it took just 15 seconds for the computerized immigration system to scan and approve my
阅读理解As many as one thousand years ago in the Southwest, the Hopi and Zuni Indians of North America were building with adobe-sun baked brick plastered with mud. Their homes looked remarkably like