25. -Did you find your pen this afternoon?
-No, I didn’t find _________, but I’ve bought _________.
A. it; it B. it; one C. one; one D. one; it
24. Xiao Li is said _________ abroad, but I don’t know what country he studied in.
A. to study B. to be studying
C. to be studied D. to have studied
23. The boys is impolite to others and this _________ hurts himself.
A. in turn B. at turns C. by turns D. in turns
22. After many years of hard work, his dream _________ at last.
A. come true B. was come true C. was realized D. realized
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。
21. Despite the fact that there are a lot of complaints about ________ CCTV’s annual Spring Festival Gala(Chunwan),most people think it was really ________ feast for our eyes this year.
A. /; a B. the; the C. the; / D. / ; /
34.(28分)
(1) 杂交 单倍体 单倍体育种 能明显缩短育种年限
(2) 花药离体培养 适宜浓度的秋水仙素处理幼苗
(3) 纯合体 F2才开始出现性状分离,F1不出现性状分离 若从F1开始则得不到所需的基因型品种
(4) 多倍体育种
(5) 有丝分裂中期, 染色体组数目
(6) 相同形态染色体为两条(有两个染色体组)
相同形态染色体为四条(有四个染色体组)
可育、 不可育
33.(每空一分,共12分)
(1) 不能进行光合作用, 生产者 竞争
(2) 光照、矿质离子
(3) 生殖隔离
(4) 样方法
(5) 营养生殖
(6) 消费者 分解者 有机物 薇甘菊等生产者所固定的光能
单向流动、逐级递减