题目

  At a local bakery I gave the cashier some money．“Please surprise someone by 11 their meal with this today，”I said．      Her l2 dropped open．“Why are you doing this?”she asked．   “To spread a little bit of  l 3，”I said，“It feels like a good day to share love．”    “This is so nice!” she smiled，I smiled too and thinking about how she was going to 14 the rest of the day looking for that “perfect” person.   A little while later I stood，looking  15  , on a subway platform in Times Square．A passer-by  l 6  his earphones and gent如图是某研究小组探究H2O2分解的条件而获得的实验结果。回答下列有关问题。（1）图1、图2所代表的实验中，实验自变量依次为_____________、_______________。（2）根据图1可以得出的实验结论是酶的催化作用具有___________________。（3）图2曲线AB段产生的最可能原因是_____________________。（4）若在图2所示的实验过程中增加H2O2酶的含量，请在图2中利用虚线绘出可能的曲线变化情况。