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下面的短文有15处空白,请根据短文内容为每处空白确定1 个最佳选项。 Cell Phone Lets Your Secret Out Your ...
下面的短文有15处空白,请根据短文内容为每处空白确定1 个最佳选项。 Cell Phone Lets Your Secret Out Your ...
admin
2020-12-24
36
问题
下面的短文有15处空白,请根据短文内容为每处空白确定1 个最佳选项。
Cell Phone Lets Your Secret Out
Your cell phone holds secrets about you. Besides the names and numbers that you’ve programmed into it, ____________ (1) of your DNA linger (遗留)on the device, according to a new study.
DNA is genetic (遗传的) material____________ (2) appears in every cell. Like your fingerprint, your DNA is ____________ (3) to you — unless you have an identical twin.
Scientists today analyze DNA in blood, saliva (唾液), or hair left____________ (4) at the scene of a crime. The results often help detectives identify____________ (5) and their victims. Your cell phone can reveal more about you___________ (6) you might think.
Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the ____________ (7) . This made her wonder whether traces of DNA lingered on cell phones — even when no blood w as____________ (8) . But she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones (翻盖手机)of 10 volunteers. They used swabs (药签) to collect____________ (9) traces of the users from two parts of the phone: the outside, where the user____________ (10) it, and the speaker, which is placed at the user's ear.
The scientists cleaned the phones using a solution made mostly____________ (11) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back for another week. Then the researchers____________ (12) the phones
and cleaned each phone once more.
The scientists discovered DNA that____________ (13) to the phone’s speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also ____________ (14) the phone.
Surprisingly, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won’t remove all traces of____________(15) from a criminal’s device. So cell phones can now be added to the list of clues that can
clinch (确定)a crime-scene investigation.
(2)
选项
A while
B as
C that
D what
答案
C
解析
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