题目

You’d better not travel during the National Day holiday. It’s so        everywhere. A. thrilling               B. fascinating           C. crowded               D. fantastic 答案：C甲数和乙数的比是4∶3，乙数和丙数的比是6∶5．甲、乙、丙三数的比是(　　)∶(　　)∶(　　)．