The most suitable title for the passage could be ______.
A. "The reasons why mobile phones are regular"
B. "Technological Innovation and their price"
C. "They way mobile phones work"
D. "Mobile phones – a must of our time"
Chọn B
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The changes possible caused by the cell phones are mainly concerned with______.
Complete the following sentences by choosing the correct answer among four options (A, B, C or D).