D. the value of information in winning games
（选项D的含义是：信息对于赢得比赛的价值。）
叶硕/著 《爱上背单词 高考关键词》天津教育出版社
Exercise：
用上述所讲单词的适当形式填空。
1. It’s difficult to keep _________ of all the new discoveries in genetics.
2. New agreements will increase _________ between the two countries.
3. I wouldn’t mind _________ jobs with her.
4. The girls were playing _________ on their teacher.
5. I’m not trying to _________ you—just answer the question.
6. The company ran into _________ when it tried to expand too quickly.
7. He often _________ the neighbors to take care of his dog when he lived there.
8. His research has been of little practical _________.
Key:
1. track 2. trade 3. trading 4. tricks
5. trick 6. trouble 7. troubled 8. value