题目

小明为设计如图所示的榫接结构，构思了下列杆1的榫头与杆2的榫头方案（竖杆的另两侧根据杆1、杆2的结构制作），其中能实现连接且榫头强度最大的是（ ） A . B . C . D . 答案：D Every year thousands of young people in England finish school and then take a year off before they start work or go to university. Some young people go to other countries and work as volunteers (志愿者). Volunteers give their time to help people. For example, they work in schools or hospitals, or they do something helpful for the environment.Pauline Jones, 18, lives in Cardiff, Wales. Next year she is going to university to study Chinese, but now she’s living in Belize. Pauline says, “I’m working with other people here to save the coral reefs (珊瑚礁) in the sea near Belize. The reefs here are beautiful, but if the sea water is polluted, the coral will die. I’m helping the coral and the fish that live around the reefs. All over the world, coral reefs are dying. We need to do something about the problem before it’s too late.”“I’m staying with a family here and I help do some housework. I don’t get any money, but that’s OK. I love my work here, and I’m learning a lot about the people of Belize—and myself! After I finish my work, I want to stay here for another three months. I want to travel around Belize and Central America.”1.Some young people from England ________ after they finish school.A. go to university abroad B. spend one year abroad as volunteersC. go to work for money D. start to work in schools or hospitals2.Pauline Jones, an eighteen-year-old girl, is living in ________ now.A. England B. China C. Belize D. Cardiff3.Pauline Jones is ________ with other people.A. studying Chinese in a university B. working to save the coral reefsC. helping do some housework D. doing some research in Wales4.From the passage, we know that the coral reefs ________.A. will die because of the pollution B. are not as beautiful as beforeC. cannot live without fish in the sea D. will probably be sold for money