What is caffeine?
举一反三
- Caffeine can increase anxiety levels.
- The most commonly used substances excludes. ( ) A: caffeine B: alcohol C: nicotine D: tea
- Athletes should avoid having drinks containing caffeine, for they are hundred-percent harmful to the athletes’ sports performance.
- The specific purpose of the “caffeine sample” is to _____. A: inform the audience of the facts about caffeine and its effects on our body B: inform the audience of the events leading to Ophelia’s death C: persuade the audience to applaud the performance D: persuade Romeo to abandon his family name
- Tea contains（ ）and protects against cancer. A: antioxidants B: caffeine C: theanine D: anti-inflammatory properties