①北京人 ②半坡居民 ③河姆渡居民 ④元谋人
A:①②③④
B:②③
C:①②③
D:②③④
下列说法中,结论错误的是( )
公文等时线刻画了在相同时间内利用公交可达的最大范围,其所能到达的最大范围边界线为等时线。读“某特大城市以中央商务区(CBD)为中心的公交等时线圈”,对公交等时线影响最小的因素是( )
My favorite ____ is ____. I like doing experiments (实验).
______ earthquake happened on ______ morning of April 14th in Yushu, Qinghai. By far, over 2,000 people have died.