题目

The place ____________ the bridge is supposed to be built should be _______ the cross –river traffic is the heaviest.    A. which; where   B. at which; which   C. at which; where   D. which; in which 答案：C关于地球自转的说法正确的是（ ）A．围着太阳转 B．绕着地轴转C．自东向西转 D．转一周需1年时间