Your cellphone holds secrets about you. Besides the names and numbers that you’ve programmed into it, traces of your DNA remain on it, according to a new study.
DNA is genetic material that appears in every cell. Like your fingerprint, your DNA is unique to you - unless you have an identical twin. Scientists today usually analyze DNA in blood, saliva （唾液）or hair left behind at the scene of a crime. The results often help detectives identify criminals and victims.
Meghan J. McFadden, a biologist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cellphone and later dropped it. This made her wonder whether traces of DNA remained on cellphones - even when no blood was involved. To find out, she and a colleague collected flip-style （翻盖式）phones from 10 volunteers. They collected invisible traces of the users from two parts of the phone: the outside, where the user holds it, and the speaker, which is placed at the user’s ear.
The scientists cleaned the phones using a liquid mixture made mostly of alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back for another week. Then they returned the phones and the researchers collected traces on each phone once more. They discovered DNA that belonged to the phone’s owner on each of the phones.
Surprisingly, DNA was even picked up immediately after the phones were cleaned. That suggests that washing won’t remove all traces of evidence from a criminal’s cellphone. So cellphones can be added to the list of clues that can settle a crime-scene investigation.
64. In a crime-scene investigation, now experts are likely to turn to ________.
A. the criminal’s fingerprint B. the DNA analysis of physical items
C. the detectives D. the criminal’s cellphone
65. According to the passage, McFadden was inspired by ________.
A. the secrets stored in people’s cellphones B. the special characters of DNA
C. a cellphone-involved case D. the challenging job of detectives
66. According to the passage, the potential application of the new study would be ________.
A. identifying criminals B. designing new cellphones
C. protecting individual privacy D. preventing cellphone-involved crimes
67. Which of the following has the closest meaning with the underlined word “identify” in Paragraph 2?
A. imagine B. recognize C. discover D. determine
第二节 完形填空（共20小题；每小题1．5分，满分30分）
阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
I really hated having to ask questions, for math is very difficult for me, so I don’t know why I thought I could take classes in pre-calculus in my junior year.
I like Mr Trout, his values and what he believed in 36 a teacher. He wanted us to really __37 what we were doing. I respected that, but all the numbers were still so 38 to me. I studied endless hours, and it 39 at first, until the algebra（代数）was over. That was 40 I learned how to ask for help on something as silly as 41 problems. I realized that the only 42_ I would survive pre-calculus would be to 43 a tutor.
Oh, how I 44 having to tell my parents that I needed a tutor. I felt so 45 .
Mr Hicks came to my house the next week. I 46 how I was going to bring myself to ask this man questions. But he 47 took his pen and paper out, asked me what chapter we were __48 , and began to teach.
It was amazing. I began to understand math. I did example 49 with him, worked them out several times until I understood the process. I didn’t feel 50 asking questions because it was helping.
Asking for help was not what I thought it would be. 51 , it was a very good thing. I actually felt smarter for it, and it was a really satisfying 52 . In fact, I plan on asking for help as 53 as possible. But I have found that I can still be 54 and ask for help when I need it. The only stupid question is the one you didn’t 55 .
36. A. as B. with C. for D. like
37. A. count B. repeat C. practice D. understand
38. A. puzzling B. increasing C. limited D. unknown
39. A. stopped B. remained C. worked D. succeeded
40. A. what B. when C. where D. whether
41. A. practical B. difficult C. math D. science
42. A. period B. result C. key D. way
43. A. become B. make C. get D. help
44. A. hated B. enjoyed C. admitted D. considered
45. A. hopeful B. weak C. patient D. lonely
46. A. decided B. feared C. imagined D. wondered
47. A. almost B. just C. even D. finally
48. A. on B. from C. about D. below
49. A. experiments B. explanations C. problems D. figures
50. A. afraid B. certain C. mad D. stupid
51. A. Anyway B. Instead C. Otherwise D. Besides
52. A. subject B. duty C. form D. feeling
53. A. long B. early C. often D. soon
54. A. independent B. comfortable C. gifted D. delighted
55. A. think B. want C. feel D. ask
High house prices can be brought under control ________ the government takes some necessary measures.
|
A．even if |
B．as if |
C．so that |
D．only if |
The little girl often has a ________ pull at her mother’s clothes when they cross the street.
|
A．hard |
B．tight |
C．heavy |
D．calm |
China is still an agricultural country and peasants ________ most of the population.
|
A．make up |
B．take up |
C．pick up |
D．give up |
The foreigners paid a visit to the theme park, ________ with satisfaction.
|
A．having left |
B．to leave |
C．leaving |
D．left |
