周末练习_59265.doc

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周末练习_59265

单词拼写 86. Seven swallows were caught near their n________. 87. Her study was simply f________ with an antique desk and chair. 88. Leaving my family was the hardest part,and some people cannot h________being away from home. 89. All those persons who are not members of a given profession or other s____________ field. 90. His e_______________ words revived my drooping spirits. 91.In addition, we have two hours a week focusing on s_________ debating skills. 92. A person or activity that is ___________ (漫无目的的) has no clear purpose or plan. 93We have computer rooms with Internet connection, a swimming pool and a r_________ centre. 94. The _____________ (飓风) left,having destroyed the whole village. 95.C____________, .our school has 20 research institutes or centres. 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 1987 as a method to identify individuals based on a pattern seen in their DNA, the molecule of which genes are made. DNA is present in every cell of the body except red blood cells. DNA fingerprinting has been used successfully in various ways, such as to determine paternity where it is not clear who the father of a particular child is. However, it is in the area of criminal investigations that DNA fingerprinting has potentially powerful and controversial uses. DNA fingerprinting and other DNA analysis techniques have revolutionized criminal investigations by giving investigators powerful new tools in the attempt to trove guilt, not just establish innocence. When used in criminal investigations, a DNA fingerprint pattern from a suspect is compared with a DNA fingerprint pattern obtained from such material as hairs or blood found at the scene of a crime. A match between the two DNA samples can be used as evidence to convict a suspect. The controversy in 1998 stemmed form a report published in December 1991 by populatio

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