题目内容

（13）（栓牛鼻的绳子）农夫老李有一个半径10米的圆形牛栏，里面长满了草，老李要将家里一头牛栓在一根栏桩上，但只让牛吃到一半草，他想让上大学的儿子告诉他，栓牛鼻的绳子应为多长？

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（18）作出习题15的蛛网图。

Gas prices are ____ here than in other parts of the country.

A. high
B. higher
C. the highest
D. more high

My ____ brother graduated from Cambridge. He is the pride of our family.

A. older
B. elder
C. the oldest
D. the eldest

I couldn't find ____, so I took this one.

A. a coat large enough
B. a coat larger enough
C. a large coat enough
D. a larger coat enough