A．According to the movement and vibrations of hot gasse……

Questions 6 to 8 are based on the following news. At the end of the news item, you will be given 15 seconds to answer each of the following questions.
Now listen to the news.How do the scientists measure the pitch



A．According to the movement and vibrations of hot gasses
B．The trade winds blow on Earth
C．The rivers
D．The sound travel through the space