题目：
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| Soon it would be the holidays, but before that, there were year exams. All the 1 had been working hard for some time, reviewing their lessons for the exams. If they didn't 2 , they would have to retake them in September. There were usually a few who 3 , but Jane didn't want to be one of them. She had worked hard all year, 4 just before the exams she was working so hard that her sister Barbara was 5 about her. She went to bed too 6 . The night before the first exam, Barbara 7 that she have an early night and take a 8 pill. She promised to wake 9 up in the morning. As she was falling asleep, Jane was afraid that she might oversleep. Her 10 kept jumping from subject to subject. At last, with the help of 11 , she went to sleep. In no time at all, she was sitting in the examination hall, looking at the examination 12 , but she couldn't answer any of the questions. 13 around her was writing pages and gages. 14 she thought hard, she couldn't find anything to write 15 . She kept looking at her 16 . Time was running out. There was only an hour to go. She started one question, wrote two sentences, 17 and tried another one. With only half an hour left she wrote another two sentences. By this time she was so worried that she started 18 . Her whole body shook. It shook so much that she 19 up. She was still in bed and it had all been a 20 dream. A minute later, Barbara called her name. | ||||
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①d②猜想二：Y气体中可能含有CO2；猜想三：Y气体中可能含有H2和CO2（1）B C E D （2）检验SO2是否除尽（3）Fe＋H2SO4=FeSO4＋H2↑（4）E中固体由黑变红，D中固体由白变蓝色①溶液为Fe3+和Fe2+离子的混合...
