第21题: [单项选择]As a developing country, we must keep ________ with the rapid development of the world economy. A. speed B. pace C. move D. step 参考答案:B 答案解析:[解析] 惯用搭配题。所填词能用于keep~with连用,[B]pace“步调,速度”,keep pace with表示“与…并驾齐驱,齐头并进”,符合句意,所以[B]为答案。[A]speed“速度”