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4. 請就下面這篇文章, 選出最佳答案以完成段落。(10%)    After the robbers leave, scientists in sterile gear file in. A team goes room by roomcollecting cotton-tipped swabs of what the robbers left behind. So far, this crime-sceneactivity looks as routine as the pacing of a television police procedural. But there's a twist.They won't be gathering and analyzing DNA or fingerprints. They'll be analyzingbacterial cells left behind by the robbers.     New science is finding that each one of us brings with us (and can't help but leavebehind) a unique bacterial signature everywhere we go - a germy John Hancock. 1   To test how much bacteria gets left behind and what it can reveal about identity,scientists will compare the swabs collected from the robbers and see if they candifferentiate them from those of the homeowners and their cat, whose paw the scientistsalso swabbed. They'll also try to see if they can tease out the signatures from the samplesfrom the scene. If they can, it will provide early proof that an outsider's bacteria is distinctenough from the homeowners' to confirm that a stranger was in the house.    If this holds true, and evidence suggests it might, it would mean crime scenes areriddled with valuable clues that are currently left untested. Crime experts agree that thefield of forensics needs cheaper, faster ways to gather investigative leads like these. 2 Thanks to advances in science, however, bacterial evidence can be sequencedaffordably, quickly and with startling accuracy. That's why forensics experts are sayingit's the leading contender for next generation investigations.    Your bacterial makeup can give away a lot about you. By age 3, everyone, evenidentical twins, has a unique coat of it that changes somewhat but remains largelyconsistent as its core and over time. 3 And in a study published last year in thejournal Science, researchers followed seven families for six weeks and were able to matchthem to their homes through bacteria alone. The more intimate you are with someone, thestudy found, the more microbes you share - though your makeup is still distinct fromtheirs.      4 Some legal experts cast doubt on how reliable the technique is - and howuseful, given that DNA would likely be wherever bacteria is present. And what does itmean if the signatures are close, but not identical? These are some of the questions thatneed answering before it's admissible in court. On top of all that, there are also somehairy ethical questions to be grappled with first. Depending on how it's sequenced, amicrobial sample can reveal private information about its host, from what diseases theymight have to what kind of work they do to their ethnicity. 5
1

參考答案

答案：B,C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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