题目

—I will go to Suzhou.— A . See you. B . Have a good time! C . What about it? D . How much is it? 答案：B（1）画一个直径为4厘米的半圆；（2）在半圆内画一个最大的三角形；（3）计算这个半圆的周长；（4）计算这个三角形的面积．