题目

隋朝大运河南北端点分别在今天的哪一省或直辖市境内？ A．江苏省、天津市                            B．浙江省、北京市 C．浙江省、河北省                            D．江苏省、北京市 答案：BAmong the 15-year-old children, some        studying in university while others are still learning to read and write. A. should have been     B. would have been C. can be           D. must be