题干
The economic plan announced by the government soon after the crisis was greeted enthusiastically ________.
A：in a row
B：for a moment
C：on all side
D：at first sight
答案(点此获取答案解析）
C
的加速度a1＝1.0 m/s2，B的加速度a2＝－2.0m/s2，根据这些条件做出的以下判断，其中正确的是 （ ）