问题 单项选择题 B型题

上皮内瘤变()

A.乳腺导管内癌

B.结肠腺瘤性息肉病

C.胃中分化腺癌侵及黏膜下层

D.卵巢交界性黏液性囊腺瘤

E.子宫颈重度非典型增生

答案

参考答案:E

解析:原位癌指的是异型增生的细胞在形态和生物学特性上与癌细胞相同,并累及上皮的全层,但没有突破基底膜向下浸润;如果癌细胞突破基底膜向深层浸润,则为浸润性癌;上皮内瘤变用来描述上皮从非典型增生到原位癌这一连续的过程,临床上将重度非典型增生和原位癌统称为上皮内瘤变Ⅲ级;交界性肿瘤指的是某些组织类型的肿瘤(如卵巢浆液性肿瘤),除了有典型的良性肿瘤(如卵巢浆液性 * * 状囊腺瘤)和恶性肿瘤(如卵巢浆液性 * * 状囊腺癌)之分,还存在一些组织形态和生物学行为介于两者之间的肿瘤,如卵巢交界性黏液性囊腺瘤。

选择题
填空题

[A] A machine has been developed that pulps paper and then processes it into packaging, e.g. egg-boxes and cartons. This could be easily adapted for local authorities use. It would mean that people would have to separate their refuse into paper and non-paper, with a different dustbin for each. Paper is, in fact, probably the material that can be most easily recycled; and now, with massive increases in paper prices, the time has come at which collection by local authorities could be profitable.

[B] Recycling of this kind is already happening with milk bottles, which are returned to the dairies, washed out, and refilled. But both glass and paper are being threatened by the growing use of plastic. More and more dairies are experimenting with plastic bottles, and it has been estimated that if all the milk bottles necessary were made of plastic, then British dairies would be producing the equivalent of enough plastic tubing to encircle the earth every five or six days!

[C] The package itself is of no interest to the shopper, who usually throws it away immediately. Useless wrapping accounts for much of the refuse put out by the average London household each week. So why is it done Some of it, like the cellophane on meat, is necessary, but most of the rest is simply competitive selling. This is absurd. Packaging is using up scarce energy and resources and messing up the environment.

[D] The trouble with plastic is that it does not rot. Some environmentalists argue that the only solution to the problem of ever growing mounds of plastic containers is to do away with plastic altogether in the shops, a suggestion unacceptable to many manufacturers who say there is no alternative to their handy plastic packs.

[E] Little research, however, is being carried out on the costs of alternative types of packaging. Just how possible is it, for instance, for local authorities to salvage paper, pulp it and recycle it as egg-boxes Would it be cheaper to plant another forest Paper is the material most used for packaging--20 million paper bags are apparently used in Great Britain each day--but very little is salvaged.

[F] It is evident that more research is needed into the recovery and re use of various materials and into the cost of collecting and recycling containers as opposed to producing new ones. Unnecessary packaging, intended to be used just once, and making things look better so that more people will buy them, is clearly becoming increasingly absurd. But it is not so much a question of doing away with packaging as using it sensibly. What is needed now is a more sophisticated approach to using scarce resources for what is, after all, a relatively unimportant function.

[G] To get a chocolate out of a box requires a considerable amount of unpacking: the box has to be taken out of the paper bag in which it arrived; the cellophane wrapper has to be torn off, the lid opened and the paper removed; the chocolate itself then has to be unwrapped from its own piece of paper. But this insane amount of wrapping is not confined to luxuries. It is now becoming increasingly difficult to buy anything that is not done up in cellophane, polythene or paper.

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