Dirty language，curse(诅咒) words，swearing. These are all ways of describing words people consider socially unacceptable. But such words are commonly said after a painful injury. So，do they serve a purpose in reducing physical pain？That is what researchers in Britain set out to discover.
Psychologist Richard Stephens wondered if using curse words truly helped people reduce physical pain. To test the theory，he asked more than 60 college students to take part in an experiment.
The students were asked to write down five words they might say after injuring their finger. One of the words was chosen as their swear word. The students were also asked to choose five words they might use to describe another object：a table. These words were their control words.
The students were then asked to hold their hand in freezing water for as long as they could. While holding their hand underwater，they were asked to repeat a swear word. Then they repeated the experiment using their control word instead.
The researchers found a link between swearing and an increased ability to deal with pain. When students repeated a swear word，they were able to hold their hand longer in the cold water. They said they experienced less pain when using swear words.
The experiment showed that swearing caused people's heart rate to increase，which permits the body to experience or ignore pain better. It also found interesting differences between men and women. The heart rate of both men and women increased. Yet swearing had a greater effect on women.
It is unclear to scientists exactly how swearing affects physical reactions to pain. Professor Stephens believes that swearing activates a different part of the brain than normal language. He says more experiments on different kinds of pain are needed to better understand the effect of swearing.
The researchers note that swear words have existed for hundreds of years. Their findings offer one reason why the custom of cursing may have continued for so long. Swear words are said with emotion. For that reason，the more someone swears，the less of an effect the words have.
Which of the following can be the best title of the passage?

A．Using Curse Words Can Reduce Physical Pain

B．People Consider Curse Words Socially Unacceptable

C．Dirty Language Is Commonly Said After a Painful Injury

D．Curse Words Are Spoken by Inexperienced Psychologists

How did Richard Stephens carry out the experiment?

A．With a questionnaire.

B．Through some examples.

C．By comparison.

D．With the help of the Internet.

How many experiments should each college student take part in at least?

A．One.

B．Two.

C．Three.

D．Four.

What does the underlined word “activates” mean?

A．Makes something active.

B．Changes something totally.

C．Stops something from happening.

D．Discovers something new.

Which of the following is one of the findings from the experiment?

A．Women use more swearing words than men.

B．The more someone swears the greater effect the words have.

C．Men's heart beats faster than women's when using dirty language.

D．Using swearing words helps women deal with pain better than men.