题目

第二卷  （非选择题，共45分） 第一节：根据提示完成句子（共10空，每空1分，满分10分） 1. ____________you have got a chance, you had better make full use of it. (既然) 2. Something unexpected always____________in this area.  (突然发生) 3. Many young people went to____________ in the countryside.  (定居) 4. Seeing that we had noticed him, he____________ quickly.  (离开) 5. Jane Goodle is____________a busy____________but she is very happy. (过着……的生活)（2012•黑龙江）如图所示，在x轴的正半轴上依次截取OA1=A1A2=A2A3=A3A4=A4A5…，过A1、A2、A3、A4、A5…分别作x轴的垂线与反比例函数y=4x的图象交于点P1、P2、P3、P4、P5…，并设△OA1P1、△A1A2P2、△A2A3P3…面积分别为S1、S2、S3…，按此作法进行下去，则Sn的值为2n2n（n为正整数）．