Over the past few days, I noticed myself increasingly thinking“I am having trouble concentrating and coffee might help”. These thoughts came to an end on Wednesday. This time, I was armed with data. I created a graph of my hours of concentration per day. One thing is very clear: based on my records, the amount of time I spend concentrating has not decreased since I quit coffee, so I can easily reject the wrong belief “I need coffee to help me concentrate.”

　　I see this as a success for self-quantifying. Whether or not it provides a general understanding of the effects of caffeine, it proves the use of self-tracking for making individualized personal decisions.

　　63. How will the author’s wife view his decision?

　　A. It is harmful.

　　B. It is admirable.

　　C. It is unreasonable.

　　D. It is challenging.

　　64. By “going cold turkey” (in Para. 2), the writer means “____”.

　　A. developing a new interest

　　B. breaking the habit suddenly

　　C. dining at a turkey restaurant

　　D. drinking a cup of cold tea

　　65. Which factor resulted in the author’s previous failure to kick the habit?

　　A. A lack of strong will.

　　B. A state of low spirits.

　　C. A series of physical symptoms.

　　D. A false concept about coffee.

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