听力原文: Paper is one of the most important products ever invented by man. Widespread use of written language would not have been possible without some cheap and practical material to write on. The invention of paper meant that more people could be educated because more books could be printed and distributed. Together with the printing press, paper provided an extremely important way to communicate knowledge.
How much paper do you use every year? Probably you cannot answer that question quickly. In 1900 the world's use of paper was about one kilogram for each person a year. Now some countries use as much as 50 kilograms of paper for each person a year. Countries like the United States, England and Sweden use more paper than other countries.
Paper, like many other things that we use today, was first made in China. In Egypt and the West, paper was not very commonly used before the year 1400. The Egyptians wrote on a kind of material made of a water plant. Europeans used parchment for many hundreds of years. Parch-ment was very strong; it was made from the skin of certain young animals. We have learnt of the most important facts of European history from records that were kept on parchment.
(29)
A.More jobs could be provided than before.
B.More people could be educated than before.
C.More books could be printed and distributed.
D.More ways could be used to exchange knowledge.
第1题
A. 在胎儿早期由肝脏和卵黄囊合成
B. B.对诊断肝细胞癌及滋养细胞恶性肿瘤有重要的临床价值
C. C.原发性肝细胞癌患者血清AFP均增高
D. D.胃癌或胰腺癌时,血中AFP含量也可升高
E. E.妊娠3~4个月,孕妇AFP开始升高
第2题
A.最适宜普查,早期发现肝癌
B.继发性肝癌AFP多为阳性
C.可在症状出现前8~11个月呈阳性反应
D.AFP阴性即可排除肝癌
第3题
下列关于AFP的说法,哪项是错误的
A.肝细胞癌AFP的阳性率为70%~90%
B.少数胃癌的AFP也可升高
C.AFP的浓度与肝癌的大小无关
D.肝癌血清中LCA结合型AFP比值大于25%
E.周围血中AFP mRNA可用于预测肿瘤的复发和转移
第5题
A.正常值<20ng/ml
B.生殖腺胚胎癌AFP增高
C.AFP>200ng/ml持续8周.可以诊断为原发性肝癌
D.AFP>500μg/L持续3周.可诊断为原发性肝癌
E.AFP升高在临床症状出现前6个月或更早发现肝癌
第7题
关于原发性肝癌,错误的是()。
A、多无肝炎病史
B、AFP 多明显升高
C、多在肝硬化的基础上发生
D、可有肝区疼痛
E、可有腹胀
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