According to the passage, performers could best meet their obligation to composers by doing which of the following?

• A、Taking courses in art appreciation.
  
  

• B、Knowing how the music was intended to be performed.
  
  

• C、Studying works written at different periods in history.
  
  

• D、Rearranging musical scores for their particular instrument.
  
  

Doctors have been able to reduce the pain caused by 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?