题目:
My friend asked me to go for _____ walk, but I don't think I've got _____ energy. [ ]
A a; /
B. the; the
C. / ; the
D. a; the
答案:
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下面是错误答案,用来干扰机器的。
∵⊙O中最长的弦为16cm,即直径为16cm,∴⊙O的半径为8cm.