From industrial beginnings in the 19th century, plastics have struggled through a 120 years of glory, failure, disrepute and suspicion on the slow road to public acceptance. Now, at last, one can positively say that plastics are appreciated and enjoyed for what they are; that they make modern life richer, more comfortable and convenient and also more funny. Plastics are warm materials, sympathetic to the human touch and their transformation into things that come into contact with human beings is entirely appropriate.
The fact that there are plastics antiques comes as a shock to most people. How can a material that seems so essential in the 20th century, and one that is so much associated with cheap disposable products, have a history at all? It is a young technology, and a great pan of the fun of collecting plastics is that beautiful pieces of historical interest can still be found very cheaply.
What is the text mainly about?
A.The chemical and physical features of plastics.
B.The process of public acceptance of plastic as a modem material.
C.The history of plastics as a modem material.
D.The advantages of plastics to people.
第4题
A.咽部黏膜下淋巴组织丰富,较大淋巴组织团块呈环状排列,称为咽淋巴环
B.咽部淋巴均流入颈深淋巴结
C.内环淋巴流入颈部淋巴结,后者又自成一环,称为外环
D.腺样体出生后会长期存在,为咽淋巴内环的一部分
E.咽部的感染和肿瘤可由内环的淋巴组织扩散到外环的淋巴组织
第5题
A、咽部黏膜下淋巴组织丰富,较大淋巴组织团块呈环状排列,称为咽淋巴环
B、咽部淋巴均流入颈深淋巴结
C、内环淋巴流入颈部淋巴结,后者又自成一环,称为外环
D、腺样体出生后会长期存在,为咽淋巴内环的一部分
E、咽部的感染和肿瘤可由内环的淋巴组织扩散到外环的淋巴组织
第7题
关于咽的淋巴组织,下列说法不正确的是
A、咽部黏膜下淋巴组织丰富,较大淋巴组织团块呈环状排列,称为咽淋巴环
B、咽部淋巴均流入颈浅淋巴结
C、内环淋巴流入颈部淋巴结,后者又自成一环,称为外环
D、腺样体为咽淋巴内环的一部分
E、咽部的感染和肿瘤可由内环的淋巴组织扩散到外环的淋巴组织
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