26. - Ring me at six tomorrow morning, will you?
- Why that early? I _____.
A. will be sleeping B. have slept C. have been sleeping D. will sleep
25. Mike _______ have known the solutions to this problem, or he would have told us.
A. mustn’t B. shouldn’t C. can’t D. needn’t
24. He apologized for his mistake, saying that he ___________no offence.
A. intended B. supposed C. considered D. pretended
23. He was rejected for the job vacancy because he couldn’t be ______even for the
interview.
A. responsible B. beneficial C. punctual D. regular
22. -I think we have to solve _____ problem of air quality for the Great International Art Festival held in our city next year.
- Yes, and the government is trying to think of _____ way out and there is more than one
solution.
A. a; the B. a; a C. the; / D. the; a
第一节 单项填空(共15小题;每小题1分,满分15分)
从A, B,C,D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. -Excuse me, can you spare me a few minutes?
-_________?
A. What’s on B. What’s up C. What is it D. What’s more
34.(11分) 白花三叶草有叶片内含氰(有剧毒)和不含氰的两个稳定遗传的品种,已知白花三叶草叶片内氰化物是经下列途径产生的(如下图)。
(1)若某一品系基因突变后,叶片内不含氰,但含氰糖苷较多,发生突变的基因是__________
(2)若两个不含氰的品种杂交,F1全部含氰,F1自交得到F2。写出亲代的基因型_________ ; F2个体的表现型及其比例是______ ____;F2含氰个体中能稳定遗传的个体所占的比例是______ ____。
(3)现有HhDd个体,怎样快速培育出含氰且能稳定遗传的个体?简要写出培育过程
①______ _ ___;
②______ ___;
③_______ 。
33.(11分)玉米种子在黑暗中萌发,测定胚芽鞘与幼根中各部分生长素含量,结果如图A所示。请据图分析回答:
(1)从图中观察玉米种子萌发过程中,合成生长素旺盛的部位是_______和_______。
(2)调节根尖伸长区细胞伸长的生长素来源于根尖的_____ __。
(3)切除玉米胚芽鞘的顶端,然后在其左侧放置含有不同浓度生长素的琼脂块,保持在黑暗中12h。胚芽鞘可能向右弯曲,弯曲角度如图B所示。生长素浓度与弯曲角度关系如图C 所示。实验要在黑暗中进行的原因是_________________。
(4)请分析说明实验结果:_______________ __。
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