27. With the help of some witnesses, three criminals were caught and asked to aid in the ________.
A. interview B. investigation C. question D. request
26. The doctor told Mary that too much ________ to the sun is bad for the skin.
A. exposure B. extension C. exhibition D. expansion
25. Nowadays, to lose weight, more wise ladies prefer to ________ regularly rather than take expensive weight-losing pills.
A. hang out B. turn up C. work out D. figure up
24. It was reported that 115 miners ________ in the flooded mine for eight days were pulled out alive at last.
A. transformed B. trapped C. defeated D. stained
23. I feel sorry for those young people who don’t ________ their aged people as I do mine.
A. send for B. take for C. look for D. care for
22. Unemployment is on the increase. A growing number of young people, ________, are finding themselves out of work.
A. in case B. all in all C. in particular D. in total
第一节:多项选择(共10小题,每小题1分,满分10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. -Flight 331 is being ________. I’d better be on my way. Goodbye.
-Bye. Happy landing!
A. appealed B. announced C. commanded D. delivered
34.
(9分)(注意:在试题卷上作答无效。)
请回答下列有关生命科学实验的问题。
⑴右图是颤藻和水绵细胞的比较观察,其中乙生物是__________,从细胞的结构可以判断该生物属于________(真核/原核)生物。
⑵在低倍镜及高倍镜下看到以下洋葱根尖细胞图,做“观察植物细胞的有丝分裂”实验时,主要观察图_______处的细胞;图B细胞所在区域称为________________区。
![]()
![]()
![]()
A B
![]()
![]()
![]()
C D
⑶检查某种毒物是否能改变细胞染色体的数目,最好选用细胞分裂到__________期的细胞用显微镜进行观察。
⑷某同学按下表所示制成临时装片进行有关实验。
|
组别 |
材料 |
实验条件 |
观察内容 |
|
A |
紫色洋葱鳞片叶外表皮 |
清水、解离液、0.3g/ml蔗糖溶液 |
质壁分离 |
|
B |
紫色洋葱鳞片叶外表皮 |
0.3g/ml蔗糖溶液 |
质壁分离 |
请回答以下问题:
①上述实验中用引流法滴加蔗糖溶液,目的是________________________。
②在A组实验中,显微镜下看不到质壁分离现象,原因是_____________被破坏,失去了选择透过性。
⑸在提取叶绿体色素的过程中,研磨叶片通常需加少量二氧化硅、碳酸钙及适量丙酮。碳酸钙的作用是______________________,丙酮的作用_____________________。
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com