But with secrets so often getting out, why do people share them at all? Shah explained that people often feel that it will help them keep a person as a friend. Another reason people share secrets is guilt over keeping it from someone close to them. A sense of distrust can develop when people who are close do not share it with each other. "Keeping or sharing secrets often puts people in a position of either gaining or losing the trust of someone," according to Shah.

　　　He added that talkative people could let secrets slip out (泄露).But this doesn't mean that it is a good idea only to share secrets with quiet people. A quiet person may be someone who keeps everything inside. To tell such a person a secret may cause them stress, and make them talk about the secret. Shah said that to judge whether to tell someone a secret.

　　　Shah said that to judge whether to tell someone a secret, you'd better put yourself in their position. Think about how you would feel to be told that you mustn't give the information away. Shah also recommended that if you accidentally give up someone's secret you should come clean about it. Let the person know that their secret isn't so secret anymore.

　　　4．What does underlined word "obsessive" mean?

　　　A．Unwilling.

　　　B．Confusing.

　　　C．Wanting to do something very much.

　　　D．Refusing to accept facts.

　　　5．What did researchers at the University of Notre Dame discover about secret-keeping?

　　　A．It can result in mental and physical problems.

　　　B．It can help promote friendships between people.

　　　C．It can harm relationships between friends

　　　D．It can result in a sense of distrust between friends

　　　6．What is the main message of Paragraph 5?

　　　A．It's better to share your secrets with quiet people.

　　　B．Quiet people suffer less stress from keeping secrets.

　　　C．Talkative people are unlikely to keep secrets.

　　　D．It's not a good idea to share your secrets with others.

　　　7．What does Shah suggest people do if they give away someone's secret by accident?

　　　A．Stay away from the person.

　　　B．Tell the affected person what happened.

　　　C．Exchange a new secret with the person.

　　　D．Buy the person a gift as an apology.

　　　Learn to cure cancer

　　　A vaccine for cancer is in the works.

　　　Lauren Landry and Chloe Tomblin are the scientists. They look in freezers(冰柜) for bacteria to use in the research. This research has its limitations-mostly because their lab is in a high school.

　　　But Lauren, 16, and Chloe,17 both students are Western Reserve Academy in the US, aren't put off by the difficulties they face in their cancer immunology(免疫学) class.

　　　"I hope we get to the point where we can get to a vaccine and write a paper," Lauren said.

　　　Both conduct research into how to engage the immune system in stopping cancer from forming.

　　　Though the lab is in a high school, they don't use textbooks. The aim is to conduct real cancer research, either by testing the effects of substances on cancer cells or developing vaccines to target the growth of those harmful cells.

　　　The idea for the class came from Robert Aguilar, who has taught at the private school for many years. Students spend the first year learning research techniques. In the second year, students swap(调换) their blue lab coats for white ones. By this stage they are well into their research projects.

　　　"If first-years need any help, they can feel free to ask second-year students," Aguilar said.

　　　Students form groups to conduct their research. One pair of students has researched the effect of capsaicin(辣椒素) on killing cancer cells. Another has tested the effect of caffeine(咖啡因) on the growth rate of breast cancer(乳腺癌) cells.

　　　But few students get to the point in their research of experimentation with mice, Aguilar said. Lauren and Chloe hope that they can make decent progress in their work.

　　　"We know they're going to be used for good," Lauren said. "If it does or doesn't work, it still has a huge impact."

　　　Aguilar teaches the students that even research that doesn't work still contributes to science in some way. He tells students that "the best part of research is failing a lot".

　　　8．What do Laudry and Tomblin do in their research?

　　　A．They use capsaicin to kill harmful cancer cells.

　　　B．They try to develop vaccines that can fight cancer cells.

　　　C．They study the effects of caffeine on breast cancer cells.

　　　D．They tested the effects of male mice eating cells.

9．What do we know about the cancer immunology class?