2016高考英语阅读理解集训。
阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。
Coffee is one of the most popular drinks throughout the world today. In fact, according to some estimates, over 30% of all adults in the world drink coffee at least once a day on the average. Coffee contains a kind of drug called caffeine. Caffeine is a chemical that stimulates (刺激) the nerves of the body. Drinking coffee tends to make people a little bit more awake―at least for a short time―because of this stimulating effect on the nervous system. A cup of coffee has, on the average, about 3% caffeine in it.
