题目

He’s trained hard for the last two years. It is ______ he did so well at the track and field meet yesterday.      A. no problem              B. no wonder              C. no doubt                D. no way 答案：Bp{font-size:10.5pt;line-height:150%;margin:0;padding:0;}td{font-size:10.5pt;}（08年周至二中二模理） 已知等差数列的前项和为，且，则过点和N*)的直线的斜率是  （　 　）         A．4                                B．3                                C．2                                D．1