3．The findings of the database imply that couples without children are ________.

　　A．as happy as people with children

　　B．less happy than people with children

　　C．happier than unsocial people

　　D．a little happier than wealthier people

　　解析：考查细节题。参照第二段中“People with children are equally happy as couples without children”可知。本题易。

　　答案：A

　　4．As an approach of scientific study，positive psychology focuses on ________.

　　A．mental suffering

　　B．psychological sickness

　　C．examining what makes life worth living

　　D．strengths that enable people to succeed

　　解析：考查细节理解。参照第三段中“But positive psychology aims to study the strengths

　　that allow people and communities to do well”可知。难度适中。

　　答案：D

　　5．MRI is used in the study of happiness in order to ________.

　　A．find out the physical quantities of happiness

　　B．look at the images formed in people’s brain

　　C．study the reaction of the brain to happiness

　　D．understand the pictures of terrible subjects

　　解析：考查推理判断。参照第三段末尾“For example，an MRI can show how one area of a person’s brain activates when he or she is shown happy pictures. A different area of the

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