题目

关于冷空气与热空气，下列说法中正确的是（） A . 冷空气的质量大 B . 热空气的质量大 C . 冷空气的密度大 D . 热空气的密度大 答案：C______ of the land in that area ______ covered with golden yellow flowers at this time of year.A. Three fifths, is B. Three fifth, isC. Three fifth, are D. Three fifths, are