读材料一、二，完成下列问题．

材料一：黄河流域图

材料二：黄河不同河段水文站测得的河流含沙量：

历史学家钱穆说：中国“学术思想最灿烂的时期是秦以前，政治社会最理想安定时期莫过于汉唐”。秦以前“学术思想最灿烂”是指（     ）

    Rose usually wakes up early in the morning. She always has her breakfast at half past six. She leaves home at about seven o’clock.. She is never late for school.
    She has many classes in the morning. At about twelve fifteen, she comes back for lunch. In the afternoon, she isn’t so busy. After school she   does her homework and plays with other children.
    In the evening, her parents come back from the factory. The family has supper together. After that, they usually read newspaper or listen to the radio for a little time. Sometimes, they watch TV. Rose goes to bed at half past nine. But her father often works late at night.