The suspect's fingerprint printed on the gun was the main __________ against him.

A．evidence         B．Information           C．crime             D．conviction

   1.  Scientists and experts have proved the uniqueness of finger-prints and discovered that no exactly similar pattern is passed on from parents to children, though nobody knows why this is the case.

 The ridge （隆起） structure on a person's fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by a new one, which bears a reproduction of the original pattern.    2.  Some criminals make use of this fact to remove their own finger-prints but this is a dangerous and rare step to take.

 Finger-prints can be made very easily with printer’s ink. They can be recorded easily.     3.   Because of the simplicity and economy of this system, finger-prints have often been used as a method of solving criminal case. A suspected man may deny a charge but this may be in vain.      4.   . When a suspect leaves finger-prints behind at the scene of a crime, they are difficult to detect with the naked eye.   5.    Some of the marks found are incomplete but identification is possible if a print of a quarter of an inch square can be obtained.

A. Special techniques are used to “develop” them.

B. A fingerprint is an impression of the friction ridges of all parts of the finger.

C. It is only when the inner skin is injured that the arrangement will be destroyed.

D. With special methods, identification can be achieved successfully within a short time.

E. A latent print is the chance reproduction of the friction ridges deposited on the surface of an item.

F. His finger-prints can prove who he is even if his appearance has been changed by age or accident.

G. Every human being has a unique arrangement of the skin on his fingers and this arrangement is unchangeable.

Your cell phone 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 their victims.

Meghan J. McFadden, a biologist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the device. This made her wonder whether traces of DNA remained on cell phones --- 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 scrubbed(meaning “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 the researchers collected the phones and repeated collecting traces on each phone once more. They discovered DNA that belonged to the phone’s owner on each of the phones.

Surprisingly, DNA showed up even in swabs that were taken immediately after the phones were cleaned. That suggests that washing won’t remove all traces of evidence from a criminal’s cell phone. So cell phones can now be added to the list of clues that can help a crime-scene investigation.

1.McFadden decided to find out whether people leave their DNA on their cell phones when she ____ .

2.The scientists allowed the volunteers to keep their cell phones for a week in order to____.

3.The last paragraph mainly tells us that cell phones ____ .

4.Which of the following is NOT mentioned in the passage?

To get cash out in the 21st century, you won’t need a bank card, a PIN(个人识别编号) or even have to move a finger. You will simply have to look the cash machine straight in the eye, declares National Cash Registers, a multinational company that makes automated teller machines, or ATMs. NCR has shown its first example machine that is believed to be the future of banking. Instead of asking you for your PIN on a screen, the Super Teller-Stella for short, asks you orally through a loudspeaker to look straight ahead while an infrared camera turns to your head, then your eye, and finally takes an infrared photograph of your iris(虹膜). For identification(识别) purposes, an iris picture is better than a fingerprint, with around 256 noticeable characteristics compared with 40 for fingerprints. This means that the chances of someone else being recognized in your place is about 1 in 1020. Once you’ve been identified, Stella greets you by name and says: “Would you like cash or a statement?” An infrared port allows the machine to send a bank statement straight to your pocket computer.

What does this passage mainly talk about?

A. A new medical instrument      B. A new type of talking machine.

C. A new type of cash machine.    D. National Cash Register

What is this new machine called?

    A. Stella                      B. ATM                C. PIN                 D. NCR

When you want to get cash out in the 21st century, you will _______.

A. need a bank card                                   B. have to put in your PIN

    C. move your finger                           D. just look directly at the teller machine

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

__1.__ Scientists and experts have proved the uniqueness of finger-prints and discovered that no exactly similar pattern is passed on from parents to children, though nobody knows why this is the case.

    The ridge(隆起) structure on a person’s fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by new one, which bears a reproduction of the original pattern. __2._ Some criminals make use of this fact to remove their own finger-prints but this is a dangerous and rare step to take.

     Finger-prints can be made very easily with printer’s ink. They can be recorded easily. __3._ Because of the simplicity and economy of this system, finger-prints have often been used as a method of solving criminal case. A suspected man may deny a charge but this may be in vain. __4._ When a suspect leaves finger-prints behind at the scene of a crime, they are difficult to detect(察觉) with the naked eye. __5.__ Some of the marks found are incomplete but identification is possible if a print of a quarter of an inch square can be obtained.

A. Special techniques are used to “develop” them.

B. A fingerprint is an impression of the friction ridges of all part of the finger.

C. It is only when the inner skin is injured that the arrangement will be destroyed.

D. With special methods, identification can be achieved successfully within a short time.

E. A latent(潜在的) print is the chance reproduction of the friction ridges deposited on the surface of an item.

F. His finger-prints can prove who he is even if his appearance has been changed by age or accident.

G. Every human being has a unique arrangement of the skin on his fingers and this arrangement is unchangeable.