—Dr. J.

　　Dear Dr. Jeffers,

　　My three-year-old son loves it when I dig my fingers into his sides and tickle （胳肢）him until he laughs uncontrollably. The other day I noticed him trying to tickle himself but he couldn’t do it. Why not?

　　—Glenn Lewis, Vancouver, Canada

　　Dear Mr. Lewis,

　　It’s because of how the brain works. The brain is trained to know what to pay attention to and what to ignore. It causes us to ignore physical feelings we expect to happen, but it causes a mild panic reaction when there is an unexpected feeling. For example, you don’t notice how your shoulder feels while you’re walking down the street. But if someone comes up behind you and touches you lightly on the shoulder, you may jump in fear. It’s that unexpected part that causes the tickle reaction.

　　—Dr. J.

　　46. What can we learn from the answer to the first question?

　　A. Some equipment is able to read human minds.

　　B. Some progress has been made in mind reading.

　　C. Test subjects have been used to make decisions.

　　D. Computer programs can copy brain processes.

　　47. People laugh when tickled by others because the feeling is _______.

　　A. unexpected

　　B. expected

　　C. comfortable

　　D. uncomfortable

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