条痕色为浅橘红色（）
A．雄黄
B．胆矾
C．磁石
D．硫黄
E．赭石
参考答案：A
— I have failed. I really don't know why I did so badly.
—________ Just try to do it better next time.
A．Look out！
B．Don't lose heart！
C．You're hopeless.
D．Can't you be more careful?
瑞利散射与波长（）成反比，米散射光谱入射辐射。
A、三次方，小于
B、四次方，大于
C、四次方，接近
D、三次方，接近
