题目

下面是一个直角三角形，如图(单位：厘米)。以直角三角形短直角边为轴，旋转一周，形成一个什么图形?请你求出它的体积。 答案：解：圆锥，3.14×42×3× 13 =50.24(立方厘米)选用括号内合适的选项补全下面短文。Hi Cathy, Greetings from Nepal! I’m sending this from an internet café in a small town north of Kathmandu. The town itself isn’t very interesting, but everything around it【1】________ (is / are) beautiful — I can see the Himalayas through the café window!The courses here are great, although maths【2】________ (is / are) certainly not my strong point.A lot of Nepal’s population lives in the mountainous parts of the country south of the Himalayas, and most of these people【3】________ (depend / depends) on growing crops and keeping animals. The standard of living in Kathmandu and the other cities【4】_______ (have / has) risen a lot recently, and the number of people likely to move into the cities【5】________ (is / are) expected to increase. It’s a real problem here. The Himalaya Times, the local English-language newspaper, 【6】________ (has / have) just published a survey showing that most young people would stay in their home villages if jobs were available. Hope all【7】________ (is / are) well with you. I’ll send more news when I can.Nazim