19．Want to stay away from colds？Put on a happy face．
Compared to unhappy people，those who are cheerful and relaxed are less likely to suffer from colds，according to a new study．It's possible that being happy helps the body fight illnesses，say the researchers from New York University．
"It seems that positive feelings may reduce the danger of illness，"said the study's chief researcher Sheldon Cohen．
In an earlier study，Cohen found that people who were cheerful and lively caught coughs and colds less often．People who showed
feelings were also less likely to tell their doctors that they felt ill．
In this study，Cohen's
interviewed 193adults every day for two weeks．During the interviews，the people told researchers about were given colds by doctors and had to stay alone in a room for six days．
The results showed that everyone in the study was equally likely to get ill．Buy for people who said they felt happy during the research period，their illness are less serious and lasted for a shorter time．
Cohen believes that when people experience positive feelings，their body may produce a chemical that helps fight illness and disease．So if you are worried abut your health，look on the bright side more often．
51．Which of the following was NOT a part of the study？D
A．People talked about their feelings every day．
B．People were kept alone for six days．
C．People were given colds by doctors．
D．People were made to feel unhappy．
52．What did the study find？D
A．People who felt happy never got ill．
B．People's feelings didn't influence their health．
C．People with good feelings became ill more easily．
D．People with positive feelings had less serious illnesses．．
53．According to Cohen，which of the following may help fight illness？C
A．Eating．
B．Crying．
C．Laughing．
D．Sleeping．
54．This passage is a/anB．
A．a(chǎn)dvertisement
B．newspaper report
C．story
D．scientist's diary
55．What is the best title for this passage？A
A．Smiles can fight colds
B．Cause of colds found
C．The danger of colds
D．How people get sick．
