题目

某同学向一支试管中按一定的顺序分别加入下列几种物质(一种物质只加一次)： a.KI溶液；b.淀粉溶液；c.NaOH溶液；d.稀硫酸；e.氯水。发现溶液颜色按如下顺序变化：①无色→②棕黄色→③蓝色→④无色→⑤蓝色。 下列叙述错误的是 A．加入以上药品的顺序是a→e→b→c→d B．溶液由棕黄色变为蓝色的原因是淀粉溶液遇碘变蓝色 C．③→④反应的化学方程式为I2＋2NaOH=NaI＋NaIO＋H2O D．④→⑤反应的离子方程式为2I－＋Cl2=I2＋2Cl－ 完形填空       On Monday at 2: 35 p.m., a bus full of passengers was going to Bungalow.It was so   1   that you had to struggle even to get room to stand-   2   about a seat.     At one stop, an old lady  3  the bus.She looked tired and I thought she was not  4  also.After a few minutes, her   5   were shaking slightly.She was looking around to find a  6  .She asked a few guys to let her sit because she had a problem of arthritis (关节炎)in her knees.  7  responded to her positively, so she was feeling helpless.      I noticed she was facing a lot of  8  and she was trying to hide it but did not  9  .I was thinking of giving her my seat, but was fighting in my mind about why I should give her my seat.I  10  it myself:Because she is old and it's my duty to help her.But I    11   that this is Mumbai (孟买), where to help anybody may be dangerous.I was hesitating (犹豫)about it.     Before I asked the lady to take my seat, an old man stood and   12   her his seat.The man, who traveled his rest journey standing, had only one leg.      I found myself in an ocean of    13    and guilt-why didn't I help her?My journey ended but I still regretted that I wasted my time in thinking when it was the right thing to do.      Now I   14   travel by bus and have decided to never waste time in thinking to help anybody whatever it results in.I will help although it is  15  to actually do. (     )1. A. broken      (     )2. A. forget  (     )3. A. got off  (     )4. A. clever  (     )5. A. hands             (     )6. A. stick             (     )7. A. Nobody            (     )8. A. damage            (     )9. A. lie               (     )10. A. answered         (     )11. A. introduced       (     )12. A. passed           (     )13. A. hope             (     )14. A. even             (     )15. A. more beneficial   B. crowded         B. talk            B. broke into      B. pretty          B. legs            B. ticket          B. Somebody        B. pressure        B. agree           B. asked           B. noticed         B. offered         B. fear            B. still           B. more dangerous   C. small C. worry  C. came on  C. selfish C. ears         C. support      C. All          C. pain         C. admit        C. refused      C. feared       C. showed       C. shame        C. never        C. harder       D. slow         D. know         D. looked for   D. well         D. shoulders    D. place        D. Neither      D. anger        D. succeed      D. suggested    D. heard        D. found        D. sadness      D. ever         D. easier