Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following people supposedly can NOT use steroids, according to the passage
A．People who are going to be pregnant. B．People who fall ill because of infection. C．People who suffer from weakened hearts. D．People who are ill from arthritis and asthma.