Be careful when you go ____ the street because the traffic

is very busy at the moment.

A．across

B．behind

C．between

D．over

下图为某中学独轮车比赛的瞬间实景拍摄，时间为夏季15点。图中直线跑道的走向大致是（）

A.东北一西南

B.东西

C.西北一东南

D.南北