问题 实验题

下图为某同学在观察自己制作的洋葱鳞片叶表皮细胞临时装片过程中,显微镜下看到的几个视野。请据图回答问题:

(1)要使图像从视野①变为视野②的状态,应将装片向__________移动;要使图像从视野②变为视野③的状态,应转动__________,换成高倍物镜;要使图像从视野③变为视野④的状态,应用__________进行调节。

(2)在视野②中可以看到,洋葱鳞片叶表皮有部分重叠,这是因为制作临时装片过程中______________________________。

答案

(1)右下方   转换器   反光镜

(2)没有将叶表皮展平

题目分析:(1)在显微镜下所看到的像是倒像,如果物像偏向哪一方,就向哪一方移动玻片标本,物像就会被移动视野的中央;视野①中的图像偏向右下方,所以向右下方移动玻片标本,就会变为视野②;视野③的图像比祼②中的图像放大的倍数大,所以要使图像从视野②变为视野③的状态,就应该转动转换器,换成高倍镜;视野④比视野③亮、清晰,此时就调节细准焦螺旋,使物像更清晰。(2)在视野②中可以看到,洋葱鳞片叶表皮有部分重叠,这是因为制作临时装片过程中没有将叶表皮展平。

完形填空

第二节(共5小题,每题2分,满分10分。)

根据短文的内容,从短文后的选项中选出能填入空白处的最佳选项。并在答题卡上相应的位置将该项涂黑,选项中有两项为多余项。

I come from a close, loving family. I have three elder brothers.

My parents owned a wood supply business.  71 When I was a kid, people used to laugh at my dad and say his volunteer work was his business and his business was his hobby .That rubbed off on me. For example, I was a Big Brother in high school, and I continued doing volunteer work in college.

In 1979, just before graduation, my brother Mark asked if I’d like to help him start a software company.  72 And I was happy that later it became very unusual in the software industry. Once I started working, I continued to volunteer.

  73 So I volunteer to company the elderly persons who live alone. I met Malcolm, who’s physically healthy.  74 He is also interested in my work. He often says “You can get caught up being the CEO of a half-billion-dollar software company very quickly.”

I learn kindness, humility(谦恭), a positive outlook on life from Malcolm.  75 But we have been together for five years and there is no end in sight.

A.So I joined his company.

B.They are successful in the business.

C.Most people volunteer for a year.

D.But they were active volunteers in our community.E. He learn how to do volunteer work from me .

F. I’m a big believer that you learn from those around you by volunteering.

G. We talk about what friends talk about.

填空题