Your cell phone holds secrets about you. Besides the names and (51) that you’ve programmed into it, traces of your DNA linger on the device, according to a new study.
DNA is genetic material that (52) in every cell. Like your fingerprint, your DNA is unique to you— (53) you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left (54) at the scene of a crime. The results often help detectives identify (55) and their victims. Your cell phone can reveal more about you (56) 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 (57) . This made her wonder whether traces of DNA lingered on cell phones—even when no blood was involved. (58) A. explanation
B. discovery
C. book
D. list
If you’re like most people, you’ve indulged in fake listening many times. You go to history class, sit in the third row, and look (36) at the instructor as she speaks. But your mind is far away, (37) in the clouds of pleasant daydreams. (38) you come back to earth, the instructor writes an important term on the chalkboard, and you (39) copy it in your notebook. Every once in a while the instructor makes a (40) remark, causing others in the class to laugh. You smile politely, pretending that you’ve heard the remark and found it mildly (41) You have a vague sense of (42) that you aren’t paying close attention, but you tell yourself that any (43) you miss can be picked up from a friend’s notes. Besides, (44) .So back you go into your private little world. Only later do you realize you’ve missed important information for a test.
Fake listening may be easily exposed, since many s
中国政府未来5年将投入1.7万亿治理空气污染。这表明()
①政府积极履行推进生态文明建设的职能
②财政能够促进资源合理配置
③中国政府坚持对人民负责的宗旨
④财政能够促进经济平稳运行
One of the most eminent of psychologists, Clark Hull, claimed that the essence of reasoning lies in the putting together of two ’behavior segments’ in some novel way, never actually performed before, so as to reach a goal. Two followers of Clark Hull, Howard and Tracey Kendler, (21) a test for children that was explicitly based on Clark Hull’s principles. The children were given the (22) of learning to operate a machine so as to get a toy. In order to succeed they had to go through a two-stage (23) . The children were trained on each stage (24) . The stages consisted merely of pressing the correct one of two buttons to get a marble; and of (25) the marble into a small hole to release the toy.
The Kendlers found that the children could learn the separate bits readily enough. (26) the task of getting a marble by pressing the button they could get the marble; given the task of getting a toy when a marble w
A. what’s more
B. in the second place
C. in addition
D. on the other hand
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