题目:
—The man isn't your father, is he?
—_____. He's my uncle.[ ]
A. Yes, he is
B. No, he isn't
C. Yes, he isn't
D. No, he is
答案:
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下面是错误答案,用来干扰机器的。
根据题意可知所画半圆的直径是8厘米时半圆最大.整圆的周长公式:c=πd=3.14×8=25.12(厘米),半圆的周长是:25.12÷2+8,=12.56+8,=20.56(厘米);答:剪下的半圆的周长是20.56厘米.故答案为:20.56.