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New research from America’s Harvard University shows people spend nearly half of their waking hours daydreaming, and not thinking about what they are actually doing. Moreover, they say this mind wandering is a sign of unhappiness. The study, to be published in the journal Science, surveyed the thoughts and moods of over 2,200 volunteers. The participants downloaded an iPhone app and sent more than 250,000 messages during the day and night. Researchers Matthew Killingsworth and Daniel Gilbert conclude that most of us are in another world for more than 46 percent of our waking hours, and that means we are unhappy. “A human mind is a wandering mind, and a wandering mind is an unhappy mind,” they said.

Dr Killingsworth said mind-wandering was ubiquitous(普遍存在的) across all activities in our daily lives. His study found that we are the most happiest when exercising or chatting with friends and the most unhappiest when working or using our computer at home. He added, "Mind-wandering is an excellent predictor of people's happiness, and that our mental lives are filled, to a remarkable degree, by the non-present. ” Professor Gilbert believes daydreaming is one of the things that make us human. He said, “Unlike other animals, human beings spend a lot of time thinking about what is not going on around them, contemplating events that happened in the past, might happen in the future or will never happen at all.”

1.How many volunteers are involved in the research?

A More than 2,200.

B 2,200.

C Less than 2,200.

D 250,000.

解析：选A。细节理解题。根据第一段第三句The study, to be published in the journal Science, surveyed the thoughts and moods of over 2,200 volunteers.可知，故选A。

2.Daydreaming is a sign of _____.

A happiness

B a lot of stress and pressure

C unhappiness

D disappointment

解析：选C。细节理解题。根据第一段第二句they say this mind wandering is a sign of unhappiness.可知，故选C。

3.Which of the following is NOT true according the passage?

A Mind-wandering was ubiquitous across all activities in our daily lives.

B We are the most happiest when exercising or chatting with friends.

C Mind-wandering isn’t an excellent predictor of people's happiness.

D Daydreaming is one of the things that make us human.

解析：选C。综合理解。根据第第二段第三句Mind-wandering is an excellent predictor of people's happiness可知，故选C。

4.What’s the meaning of the underlined words “chatting with”?

A 购物.

B 制作.

C 上网.

D 聊天.

解析：选D。词义猜测题。根据语境判定应该是“聊天”。故选D。

5.The passage is about _______.

A happiness

B mind

C daydreaming

D dream

解析：选C。主旨大意题。文章所述内容为“白日梦”。故选C。