1. Which of the following is the main topic of the passage?
A. The influenza virus
B. Immunity to disease
D. Chemical molecules
2. According to this passage, bacteria are
A. poisons C. larger than viruses
B. very small D. Plants
3. The word strictly in paragraph 1 could best be replaced by
A. Unusually C. broadly
B. Completely D. Exactly
4. The atomic structure of viruses
A. is variable
B. is strictly defined
C. cannot be analyzed chemically
D. is more complex than that of bacteria
5. Why does the author say that viruses are alive?
A. They have a complex atomic structure
B. They move
C. They multiply
D. They need warmth and light
6. The word unlimited in paragraph 1 could best be replaced by which of the following?
A. very small C. very similar
B. very large D. very different
7. According to the passage, how does the body react to the influenza virus?
A. It prevents further infection to other types and strains of the virus
B. It produces immunity to the type and strain of virus that invaded it
C. It becomes immune to types A, B, and C viruses, but not to various strains within the types
D. After a temporary immunity, it becomes even more susceptible to the type and strain that caused the influenza
8. The passage discusses all of the following as characteristics of pandemics EXCEPT
A. they spread very quickly
B. they are caused by type-A virus
C. they are regional outbreaks
D. they occur once every ten years