已知I-、Fe2+、SO2、Cl-、H2O2在酸性溶液中的还原性强弱顺序为： S
题型：选择题
问题：
已知I-、Fe2+、SO2、Cl-、H2O2在酸性溶液中的还原性强弱顺序为： SO2>I->H2O2>Fe2+>Cl-，则下列反应不可能发生的是[ ]
A．H2O2+H2SO4==SO2+O2+2H2O
B．2 I-+2Fe3+==I2+2Fe2+
C．2Fe3++SO2+2H2O==2Fe2++SO42-+4H+
D．SO2+2H2O+I2==H2SO4+2HI
题型：选择题
短文改错(共10小题；每小题l．5分，满分l5分)
此题要求改正所给短文中的错误。对标有题号的每一行做出判断：如无错误，在该行右边横线上画一个勾(√)；如有错误(每行只有一个错误)，则按下列情况改正：
此行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并
也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号(^)，在该行右边横线上写出该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
I'm a senior three student．I often do bad in my
exams，so I have been trying to catch up the others．
But I'm such concerned about my marks that sometimes
l cannot eat or sleep well at a night．I’m afraid that
I may get low 
marks in the tests again even if l work
hard than before． I have no courage to face low marks．
I cannot fix my mind to my study，whenever I think of
This. It is obvious that the worry had a bad effect on
my school works．I’m feeling very sad．Would you
please telling me how I should deal with my worry?