
Mobile phone - - - - .
A) was used first by Cooper's rival.
B) didn’t become available to the public.
C) has a lot of security risks.
D) was invented in 1973.

Mobile phone - - - - .
A) was used first by Cooper's rival.
B) didn’t become available to the public.
C) has a lot of security risks.
D) was invented in 1973.
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