题目内容：
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 eell 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．
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答案解析：