问题 选择题

用显微镜观察人的血涂片,发现视野内有一淋巴细胞(如图)。为了进一步对该细胞进行观察,应将其移到视野正中央。则临时装片的移动方向为(   )

A.右上方

B.右下方

C.左上方

D.左下方

答案

答案:A

题目分析:在显微镜下看到的物像是上下左右均颠倒的物像,所以移动玻片标本时,标本移动的方向正好与物像移动的方向相反,如我们向右移动玻片标本,而在显微镜内看到的物像则是向左移动的,该图中物像位于视野中央偏右上方,要想把它移到视野中央,应该向右上方移动玻片标本,物像才向左下方移动,才能移到视野中央,选A。

阅读理解

阅读理解。

     Step into Pat Lundin's home and you'll be greeted by 500 smiling faces of dolls. Lundin, 82, describes

herself as "doll crazy". And she's not alone.

     As a member of Timeless Treasures Doll Club of Largo, she frequently meets with 25 other women who

share her hobby. Once a month, they gather at the Palms of Largo to show off their latest finds and catch

up on news in the world of doll collecting.

     On Saturday, the club will hold the Palms of Largo Fifth Annual Doll Show. The program will include 37

vendors (卖主) with both classic and contemporary dolls for sale.

     "Timeless Treasures is a club that's open to doll lovers regardless of the age of the doll," said Judy Smith,

president of the organization."Some doll clubs require members have a certain number of antique dolls, but we

don't. we make sure we are not terribly formal."

     Smith, 71, is a retired schoolteacher who owns Judy's Doll Hospital, a part-time business she operates out

of her home. She will have a table offering repair and appraisal (鉴定) services. Smith firs began studying and

collecting dolls in her early 20s,in Glassboro, New Jersey, she does not know how many dolls she owns, or

how many repairs she has made over the years. But she does know the age of her oldest doll.

     "She's 129," Smith said."It is a German-made doll that belonged to my grandmother, and it sits in my living

room."

     The show is for both the beginner as well as the experienced collector, said Anita Munson, one of the

show's organizers.

      Over the years, Munson, 82, has learned how to identify a valuable doll. "Generally speaking porcelain

(瓷制的) dolls are the most valuable," she said. "But the porcelain will not be shiny."

     Smith believes many people will attend to find out how much their dolls are worth. She wants them to

know more.

     "Because the dolls reflect what the children were wearing and doing at a particular period of time, they can

be a great history lesson for children now," she said.

1. According to the passage, Timeless Treasures is _____.

A. a club for doll lovers

B. a company selling dolls

C. a group of retired teachers

D. an organization repairing toys

2. We can infer that the show has been held _____.

A. twice

B. four times

C. six times

D. eight times

3.What can we learn about Smith?

A. She owns the oldest doll in the world

B. She has collected about five hundred dolls

C. She has studied dolls for about fifty years

D. She worked as a businesswoman before retirement

4. Smith wants people to know _____.

A. porcelain dolls are not valuable

B. collecting dolls is a way to make money

C. dolls have nothing to do with tradition

D. dolls may help children learn about history

5. The passage is written mainly to _____.

A. describe the colorful life of a group of elderly women

B. explain why some people like collecting old dolls

C. introduce a recent doll show and its host organization

D. offer knowledge and experience about doll collecting

问答题 简答题