问题
单项选择题
曲线y=sinx（0≤x≤π／2）与直线x=π／2，y=0围成一个平面图形。此平面图形绕x轴旋转产生的旋转体的体积是：（）
A.π2／4
B.π／2
C.π2／4+1
D.π／2+1
答案
参考答案：A
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曲线y=sinx（0≤x≤π／2）与直线x=π／2，y=0围成一个平面图形。此平面图形绕x轴旋转产生的旋转体的体积是：（）
A.π2／4
B.π／2
C.π2／4+1
D.π／2+1
参考答案：A
| 完形填空。 | |||
| Two weeks before Christmas , I went 1 London with my mother. I shall never forget the day. The streets were 2 people. The shop windows were very bright. My mother held my hand and we both went into a toy shop. The shop was full of 3 . There were nice toys 4 . Then I saw Father Christmas himself! I pulled my mother 5 the hand. " Please 6 me to Father Christmas, I said. There were 7 children near Father Christmas. They were standing 8 line. Father Christmas spoke to every one of them. At last it was my 9 . "Hello, little Tom," he said to me. As soon as I heard his 10 ,I found out that he was my uncle, John Smith. | |||
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