题目

某棉农获知脱落酸可以促进叶片脱落的原理后，采收前在棉田喷施了一定量的脱落酸，试图除去棉花叶片便于机械采收，但效果不明显，为探究其原因，生物兴趣小组设计了下面的实验方案。 实验假设：生长素对脱落酸的功能有抑制作用。实验方案：取若干长势相同、处于生殖生长末期的棉花植株，均分成甲、乙、丙三组，做右图所示的处理，观察三组植株叶片脱落的先后。（1）生长素主要由根尖产生，生长素的运输方式为____________。生长素既能防Soon it would be the holidays, but before that, there were year exams. All the     in the school had been working hard for some time, reviewing their lessons for the exams. If they didn’t    , they would have to retake(重考) them in September. There were usually a few who    , but Jane didn’t want to be one of them. She had worked hard all year,     just before the exams she was working so hard that her sister Barbara was     about her. She went to bed too    . The night before the first exam, Barbara     that she have an early night and take a     pill. She promised to wake     up in the morning.As she was falling asleep, Jane was afraid that she might oversleep. Her     kept jumping from subject to subject. At last, with the help of    , she went to sleep. In no time at all, she was sitting in the examination hall, looking at the examination    , but she couldn’t answer any of the questions.     around her was writing pages and pages.     she thought hard, she couldn’t find anything to write    . She kept looking at her    . Time was running out. There was only an hour to go. She started one question, wrote two sentences,     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    . Her whole body shook. It shook so much that she     up. She was still in bed and it had all been a     dream. A minute later, Barbara called her name.小题1:A．teachersB．studentsC．classmatesD．poets小题2:A．prepareB．missC．gainD．pass小题3:A．succeededB．failedC．endedD．harvested小题4:A．butB．soC．andD．because小题5:A．excitedB．frightenedC．worriedD．satisfied小题6:A．earlyB．lateC．sadlyD．eagerly小题7:A．insistedB．admiredC．orderedD．wished小题8:A．sleepingB．starvingC．excitingD．breathing小题9:A．himB．herC．themD．herself小题10:A．handB．eyeC．mindD．body小题11:A．her sisterB．her parentsC．the lessonsD．the medicine小题12:A．resultB．marksC．deskD．paper小题13:A．The teacherB．The studentsC．No oneD．Everyone小题14:A．IfB．ThoughC．SoD．How小题15:A．withB．aboutC．onD．to小题16:A．watchB．textbookC．sisterD．subject小题17:A．gave upB．put offC．look aroundD．thought over小题18:A．examiningB．drowningC．copyingD．crying小题19:A．raisedB．wokeC．turnedD．cheered小题20:A．niceB．wonderfulC．terribleD．special