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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

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26. The doctor told Mary that too much ________ to the sun is bad for the skin.

A. exposure        B. extension       C. exhibition       D. expansion

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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

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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

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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

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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

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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

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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_____________________。

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