C When cell phone users totaled to a certain number.
D When the number of cell phones decreased to a certain number.
3. What is said about cell phone use in paragraph 4?
A The number of cell phones in use exploded in the late 1980s and part of the 1990s.
B The number of traffic deaths was reduced in the late 1980s and part of the 1990s due to cell phone use.
C Cell phone users are likely to be involved in traffic accidents.
D The use of cell phones has a life-saving effect for pedestrians and drivers.
4. What is said about cell phone use in the mid-1980s in paragraph 5?
A It had a life-taking effect because there werent enough cell phones in use then.
B The increased use of cell phones then caused a life-taking effect.
C Traffic fatalities increased then because the number of cell phones in use decreased.
D Traffic fatalities decreased then because the number of cell phones in use increased.
5. Which of the following statements DOES NOT answer the question What caused the life-saving effect to occur in the early 1990s?
A There were more cell phone users during that period.
B The number of cell phone users reached about 100 million.
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