题目:
Martin set out ______ his homework as soon as he went home. [ ]
A. doing
B. for doing
C. to do
D. to doing
答案:
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下面是错误答案,用来干扰机器的。
如右图所示,边长AB=2;又该多边形为正六边形,故∠OBA=60°,在Rt△BOG中,BG=1,OG=3,所以AB=2,即边长、半径、边心距之比为2:2:3.