问题 实验题

请根据显微镜图示,结合有关操作技能,回答下列问题:

(1)请写出下列结构名称:

[2]           、  [3]          

[4]            、 [6]           

(2)如果在对光后看不到明亮的视野,你认为下列哪项措施最无效?  (   )

A.转动目镜

B.转动转换器

C.转动遮光器

D.转动反光镜的位置

答案

(1)[2] 转换器  [3]物镜  [4]载物台  [6]粗准焦螺旋  (2)A

试题解析:(1)在显微镜的结构中,转换器的作用是调换物镜的,目镜和物镜的作用是放大物象的,载物台是承载临时装片的,粗准焦螺旋和细准焦螺旋是升降镜筒的,粗准焦螺旋升降的范围大。

(2)对光时,需要使通光孔、物镜、镜筒、目镜在一条直线上,这样,才能使反光镜反射来的光线进入眼睛,找到明亮的视野,目镜在镜筒上,不需要转动,可能是物镜和通光孔没和镜筒在一条直线上,可以转动转换器,或是遮光器,也可能是反光镜反射光线的角度不对,没有进入我们的眼睛,这时,需要转动反光镜的位置。

阅读理解

阅读理解。

    When my family moved to America from a small village in Guangdong, China, we brought not only our

luggage, but also our village rules, customs and culture.One of the rules is that young people should always

respect elders. Unluckily, this rule led to my very first embarrassment (尴尬) in the United States.

    I had a part-time job as a waiter in a Chinese restaurant. One time, when I was serving food to a

middle-aged couple, the wife asked me how the food could be served so quickly. I told her that I had made

sure they got their food quickly because I always respect the elderly. As soon as I said that, her face showed

great displeasure. My manager, who happened to hear what I said, took me aside and gave me a long lecture

about how sensitive Americans are and how they dislike the description "old". Then I walked back to the table

and apologized to the wife. After the couple heard my reason, they understood that the problem was caused

by cultural differences, so they laughed and were no longer angry. 

    In my village in China, people are proud of being old. Not so many people live to be seventy or eighty, and

people who reach such an age have the most knowledge and experience. Young people always respect old

people because they know they can learn from their rich experience.

    However, in the United States, people think "growing old" is a problem since "old" shows that a person is

going to retire or that the body is not working well. Here many people try to keep themselves away from

growing old by doing exercises or jogging, and women put on makeup, hoping to look young. When I told

the couple in the restaurant that I respect the elderly, they got angry because this caused them to feel they

had failed to stay young. I had told them something they didn't want to hear.

    After that, I changed the way I had been with old people. It is not that I don't respect them any more;

I still respect them, but now I don't show my feelings through words.

1.The writer brought the couple their food very fast because ______. [ ]

A.the manager asked him to do so

B.he respected the elderly

C.the couple wanted him to do so

D.he wanted more pay

2.When the writer called the couple, "elderly", they became ______.[ ]

A.nervous

B.satisfied

C.unhappy

D.excited

3.Which of the following is TRUE? [ ]

A.The more the writer explained, the angrier the couple got.

B.The writer wanted to show his feelings through words after his experience.

C.The manager went back to the table and apologized to the couple.

D.From this experience, the writer learned more about American culture.

4.What is the best title for this passage? [ ]

A.Different countries, different customs

B.Old people, old customs

C.Different restaurants, different services

D.Differences between old and young

5.What is the Chinese meaning of the underlined word, "sensitive"? [ ]

A.敏感的

B.好战的

C.自私的

D.友好的

多项选择题