Now listen to a short conversation and a passage on the tape. This will be played once on the recorder. You may make notes while you are listening but you should not answer any questions until the reading is over. Qustion 1 According to the passage, what does a card holder have to worry about

正确

错误

Your cell phone holds secrets about you. Besides the names and (51) that you’ve programmed into it, traces of your DNA linger (逗留) 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 (唾液), 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) , she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs (药签) to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user’s ear.

The scientists scrubbed the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones (62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more.

The scientists discovered DNA that (63) 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 handled the phone. (64) , DNA showed up even in swabs that were taken immediately after the phones were scrubbed (擦洗). That suggests that washing won’t remove all traces of evidence from a criminal’s device. So cell phones can now be added to the (65) of clues that can decide a crime-scene investigation.

正确

错误

菌斑染色

识别保健牙刷

问卷调查

现场考试

个别提问

You really have to get very old before you realize you’re old. I’m in my middle fifties and I don’t feel old yet. However, sometimes I look back at my childhood and (21) things to the way life is for (22) kids. Some things have certainly changed. One area of change is television. Some changes have been improvements. Some changes, on the other hand, have been (23) . When I started school, most people didn’t have a television; TV was just beginning to get (24) . My father decided to go all out and buy a 16 inch black and white Motorola set, I still remember watching the Lone Ranger save people from the (25) guys on that awesome electronic machine. That was exciting! Now, (26) have larger pictures in full color. The pictures are clearer and the sound is much more realistic. The new high definition sets are made to rival (27) screens. The variety and quantity of programming has (28) greatly. There are hundreds of channels and more shows than one person could ever watch. There are many fine entertainment and educational (29) There’s also a lot of garbage, stuff that most parents don’t want their kids exposed to. Overall, we have more choices, and that is good. I wonder what (30) will be like when today’s kids are my age.

正确

错误

Your cell phone holds secrets about you. Besides the names and (51) that you’ve programmed into it, traces of your DNA linger (逗留) 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 (唾液), 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) , she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs (药签) to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user’s ear.

The scientists scrubbed the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones (62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more.

The scientists discovered DNA that (63) 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 handled the phone. (64) , DNA showed up even in swabs that were taken immediately after the phones were scrubbed (擦洗). That suggests that washing won’t remove all traces of evidence from a criminal’s device. So cell phones can now be added to the (65) of clues that can decide a crime-scene investigation.

正确

错误

菌斑染色

识别保健牙刷

问卷调查

现场考试

个别提问

You really have to get very old before you realize you’re old. I’m in my middle fifties and I don’t feel old yet. However, sometimes I look back at my childhood and (21) things to the way life is for (22) kids. Some things have certainly changed. One area of change is television. Some changes have been improvements. Some changes, on the other hand, have been (23) . When I started school, most people didn’t have a television; TV was just beginning to get (24) . My father decided to go all out and buy a 16 inch black and white Motorola set, I still remember watching the Lone Ranger save people from the (25) guys on that awesome electronic machine. That was exciting! Now, (26) have larger pictures in full color. The pictures are clearer and the sound is much more realistic. The new high definition sets are made to rival (27) screens. The variety and quantity of programming has (28) greatly. There are hundreds of channels and more shows than one person could ever watch. There are many fine entertainment and educational (29) There’s also a lot of garbage, stuff that most parents don’t want their kids exposed to. Overall, we have more choices, and that is good. I wonder what (30) will be like when today’s kids are my age.