Which of the following best states the main idea of the passage?

• A、It is easier to study medicine than music.
  
  

• B、Painters and composers use totally different methods to reach the public.
  
  

• C、All musicians must know how to time their own instruments.
  
  

• D、Musicians must acquire technique and understanding to perform well.
  
  

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 2

21. The machinery outside the calorimeters records everything________

22. Nicola Waiters had time for the experiments________

23. Volunteers have to get prepared for the time in the calorimeter________

24. The experiments show that high-fat diets________

25. It seems Nicola will continue________

A. the volunteers do

B. to support their further sessions of experiment

C. because the life there can be very boring

D. make people overeat

E. because she was her own boss

F. after passing a high-protein test