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Spot dictation

聽力部分

經典題目操練：(聽力教程P31)

A lie detector is a machine that is designed              (1) if a person is telling the truth or not. It does this by measuring a person’s              (2) reactions while being questioned. It is also known as a polygraph.

American medical student John Larson invented the polygraph machine                  (3). Polygraph means                (4). The name was chosen because the machine records many body reactions while a person answers questions. The machine is               (5) the idea that stress produces changes in the body when a person does not tell the truth.

Taking a lie detector test            (6) several devices on different areas of a person’s body. Rubber tubes on the            (7) record breathing. Two small metal plates             (8) the fingers measure sweat gland activity. A device on the                (9) measures the blood pressure. The body’s reactions are recorded by another device.

During a lie detector test, an expert first asks                 (10) questions that show how the person’s body                (11) when giving true and false answers. Then the experts ask the important questions. All this takes about                (12). Later, the experts read the information and decide if the person answered the questions                 (13) or not.

Lie detectors are used in the United States mostly by law enforcement                (14). Lawyers also sometimes use them.

There is                    (15) about the use of a lie detector. Some people believe it violates                (16). Many people do not believe it really can tell if a person is lying or not.

The American Polygraph Association says a                 (17) expert can tell most times if the person has lied. But even that organization admits that mistakes happen.

Polygraph results                 (18) are not considered legal evidence in most United States courts. They are permitted in some courts and in some states. Some areas of the country       

              (19) the use of lie detector tests as evidence. The Supreme Court has not yet ruled about the use of lie detector test results in the American                     (20).

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答 案

1. to show

2. bodily

3. in 1921

4. many writings

5. based on

6. involves placing

7. chest and stomach

8. attached to

9. arm

10. a series of

11. reacts

12. two hours

13. truthfully

14. agencies

15. much debate

16. a person’s privacy

17. trained

18. generally

19. have banned

20. legal system