坡度是两变坡点间（）之比。
A、水平距离与高程
B、长度与高程
C、长度与高差
D、高差与其水平距离
参考答案：D
选出适合句意的词
1. Are there ______ ( any / some ) students in the room?
2. Tom has got four ______ ( parents / grandparents).
3.I have got an American friend, _______ (his / he's) name is Tony.
4.She ______ (is / has ) got a brother.
5.Thank you for ______ ( help / helping ) me.
写出《秋词》（唐·刘禹锡）原文及其释义。
