题目

在一个长方形中有________组对边是平行的． 答案：【答案】两【解析】根据长方形的性质即可解答．此题考查长方形的性质，属于基础题，熟记常见的基本图形的性质即可解答此类问题．根据长方形的性质可得：长方形的两组对比分别平行，故答案为：两．He wrote his ______ novel when he was ______.A．five;fifties B．fifth;fifty C．fifth;fiftieth D．the fifth;fifty