阅读理解。 Chocolate lovers know that eating chocolate can give them a feeling of happiness. Now it is known too that eating chocolate may also make people cleverer. Dr. Bryan Raudenbush recently made a study to see if eating chocolate can make people cleverer. The U. S. scientist knew that chocolate had several stimulants (兴奋剂). But he was not sure how these stimulants did their job and thus made people clever. To find out, Dr. Raudenbush gave the first group of people 85g of milk chocolate to eat and the second group ate no chocolate at all. After 15 minutes, he tested their memory, and he also tried to see if they were able to deal with problems right. The first group had higher scores. They were able to remember more words and pictures than the second group, and they could solve (解决) problems much faster. Dr. Raudenbush then decided that the stimulants in chocolate could make people do things faster and better. And he suggested that if people wanted to do a better job, eating chocolate from time to time may be of help. Of course eating chocolate can't make sure that you can study well without hard work. You'll still need to study hard to get good results. 1. Many people like eating chocolate because it can make them _____. A. pleased B. excited C. funny D. crazy 2. Dr. Raudenbush asked some people to eat milk chocolate because _____. A. he knew that they liked chocolate very much B. he wasn't sure how many people wanted to eat chocolate C. he knew it was a kind of good food D. he wanted to know if the stimulants could help people do things better 3. The result of the experiment showed that _____. A. the second group did things better than the first group B. the first group did things as well as the second group C. both groups didn't do things well D. the first group did things better than the second group 4. The experiment showed that eating chocolate could make people _____. A. grow stronger B. become cleverer C. grow faster D. become healthier 5. According to the passage, if you want to get good marks, you _____. A. should eat lots of chocolate B. mustn't eat any chocolate C. still need to study hard D. can just eat chocolate without study