题目

 — Do you know sound travels very fast?  — Yes. But light travels        sound.     A. as fast as                           B. a little faster than         C. much faster than                     D. slower than 答案：C“至（贞观）八年、九年，频至丰稔（rěn丰收），米斗四五钱，马牛布野，外户动辄数月不闭。”材料描述的是A. “开皇之治”B. “贞观之治”C. “开元盛世”D. “康乾盛世”