47. What is mainly talked about in the passage? (A) How to do exercises daily. (B) How to lose weight easily. (C) How to work comfortably. (D) How to eat and drink regularly.

45. What is TRUE about the politeness study discussed in the passage? (A) The study was reported in many cities of the world. (B) New York was the most suitable city for the experiment. (C) Sixty tests were designed to see if people are polite to each other. (D) Experiments were performed to see if common good manners exist.