In this section, you will hear a news report. At the end of the news report, you will hear two questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、Nicotine, sugar and some plant roots.
B、Carbohydrates, lean protein and sugar.
C、Caffeine, ginseng and sugar.
D、Cheese, caffeine and ginseng.
A、They can have steady heart rate.
B、Their metabolism will be slowed down.
C、They can fall asleep quite soon.
D、They can become really energetic for a long time.