题目内容：
阅读下列短文，选出能填入的最佳答案：What kinds of people often give drugs to their children?Where in the world do people take drug before going to work?The answers are simple--ordinary people，juM about_33_．
And the drug_34_question is caffeine．Scientists estimate that over 70％of the world’Spopulation takes caffeine daily．_35_ drink it in tea and coffee．Children drink in tin Coca Colaand_36_ soft drinks．It is also found in chocolate．_37_，most people in the most places at anytime are under the_38_of the drug．
There have been many scientific investigations_39_ the exact effects of caffeine．Most peo-pie agree that it_40_ the nervous system and helps the body make efficient use of energy．This iswhy many people_41_ Asia drink tea with food and why westerners often end their meals_42_a cup of coffee．
Because the effect of caffeine is so_43_，there have been_44_ attempts to stop people U-sing it．A U．S．religious group which_45_ the use of caffeine is generally regarded as eccentric(反常的)．But because nearly everybody takes it，the total effect of caffeine_46_ people ishuge．Caffeine is the drug that changed the world．
Both tea and coffee were introduced to the West around 300 years ago．The effect of thesenew drinks was felt_47_．In New York，coffee houses were_48_ with people making plans，_49_ business and doing deals．And the deals done in the coffee houses were partly responsible _50_a rapid increase in American trade．History was moving_51_ that direction anyway．Butthe arrival of coffee_52_everything up．
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