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

• A、True
  
  

• B、 False
  
  

• C、 Not Given
  
  

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?

Tension in life can increase the likelihood of getting a stomach ulcer.

• A、True
  
  

• B、False
  
  

• C、Not Given