In which year did China step into the 4G era?
A.1987
B.1995
C.2008
D.2013
正确答案：2013
In which year did China step into the 4G era?
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At the end of the 1980s, Chinese people made short urban trips （）.
According to the 24 solar terms, one should not take off winter clothing before Vernal Equinox.
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