Questions 19 to 21 are based on the passage you have just heard.19.
A: The function of the human immune system.
B: The cause of various auto-immune diseases.
C: The viruses that may infect the human immune system.
D: The change in people’s immune system as they get older.
A: The function of the human immune system.
B: The cause of various auto-immune diseases.
C: The viruses that may infect the human immune system.
D: The change in people’s immune system as they get older.
举一反三
- Passage2 Questions 19 to 21 are based on the passage you have just<br/>heard. A: Strengthening people's immunity to infection. B: Better understanding patients' immune system. C: Helping improve old people's health conditions. D: Further reducing old patients' medical expenses.
- The text mainly supplies information for answering which of the following questions A: Can the immune system be affected by emotional factors B: Why can our bodies fight the bacteria and viruses which cause diseases C: How can the immune system be affected by emotional factors D: Why can't blood cells in bereaved people's bodies work properly
- They learn about disease and how the human immune system fights disease.
- Your immune system protects against many______ agents. (infect)
- The immune system is compared to a library.