题目

如图，⊙A和⊙B都与x轴和y轴相切，圆心A和圆心B都在反比例函数的图象上，则图中阴影部分的面积等于_________（结果保留π）．   答案：π解析:略 Today the number of people ________ English in China is increasing rapidly.A．learningB．are learningC．to learnD．learn