单选题
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.
C、
More cell phones were used to call 911 when accidents occurred.
D、
Cell phones enabled people to have quick access to 911 services.
【正确答案】
B
【答案解析】
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