（）是地表倾斜的程度，也是竖向地形的一种特征要素。用等高线表示的地形图上，坡度可以用等高踞比两条等高线的平距来求得。
参考答案：坡度
Doctors should take special care when treating children because their breathing rate is different from _____ of adults．
A．that
B．those
C．some
D．one
I do not doubt ________ win in the race.
A．whether he will
B．whether will he
C．that he will
D．that will he
