A:①②③④
B:②③④
C:①②③
D:①③④
Be careful when you come _______ the street, because the traffic is very busy at the moment.
组一组。
没:____、____
点:____、____
勃列日涅夫在执政前期对赫鲁晓夫时期的政策进行了调整。他把经济改革的重点放在重工业上,其根本目的是