There has been a change in doctors' understanding of the cause of stomach ulcers.

• A、True
  
  

• B、 False
  
  

• C、 Not Given
  
  

Why does the author mention athletes and ballet dancers?

• A、To contrast the requirements of each field of study.
  
  

• B、To discourage music students from continuing their studies.
  
  

• C、To motivate students to work harder to achieve their goals.
  
  

• D、To show that music students must develop great physical coordination.
  
  

Task 1

16. Paragraph     ①    

17. Paragraph      ②    

18. Paragraph     ③    

19. Paragraph     ④    

20. Paragraph     ⑤    

A. What does the Calorimeter Look Like Inside?

B. What Program Was Designed for the Experiment?

C. What Is a Calorimeter?

D. Try to Find out Why People Gain and Lose Weight

E. How do the Volunteers Kill the Time?

F. Why did Nicola Join in the Experiments?