问题 单项选择题 A1/A2型题

关于肾性骨营养不良的叙述,错误的是()

A.β2-微球蛋白排泄受损,大量沉积于骨,可发生骨淀粉样变

B.高血清铝水平可抑制骨细胞功能引起骨发育不全

C.慢性肾衰常见高甲状旁腺素性骨疾病或纤维性骨炎

D.骨发育不全时类骨质不会增加

E.成骨细胞形成受损

答案

参考答案:E

解析:慢性肾衰时肾脏排磷能力下降,导致高磷血症;而钙磷乘积存在一定的平衡关系,从而导致低钙;低钙刺激PTH分泌,并使甲状旁腺增生,因此慢性肾衰常见高甲状旁腺素性骨疾病或纤维性骨炎;慢性肾衰时血清铝水平增高,抑制骨细胞功能,引起骨发育不全;骨发育不全与骨软化症的区别在于骨发育不全时类骨质的量不会增加,而骨软化症时有大量类骨质形成。慢性肾衰时β2-微球蛋白排泄受损,沉积于骨可发生骨淀粉样变。肾衰不会引起成骨细胞形成受损,反而由于甲状旁腺功能亢进,可使成骨细胞活性增高。

阅读理解

English nowadays is widely used in science, business, the media and popular culture. For example, 80% of e-mails on the internet are in English. But where will English be at the end of the 21st century?

One view is that English is going to become even more important as a global language, being most widely used in trade and media while some other languages will become less important or just disappear. Another view is that English is already breaking up into several separate languages. There are already dictionaries of the “New Englishes”, such as Australian English, full of words that a British English speaker would not recognize.

Hopefully, neither of these things will happen. Although different varieties of English will continue to develop around the world, standard English will survive for international       communication. However, it is impossible for one language to totally control the world. Already, other languages are fighting back against the control of English on the net. Governments around the world are also starting to protect smaller languages and recognize the importance of keeping a variety of cultures and languages. English will probably stay in control for a long time, but it certainly won’t become the only language in the world.

小题1: According to the situation, how many people do you think speak English now?

A.200 million

B.300 million

C.500 million

D.a billion小题2:At present, what is the most important language in the world?

A.Chinese

B.English

C.French

D.German小题3:What is the best title of the passage?

A.The Change of English

B.Different Varieties of English

C.The Future of English

D.The Cause of English Change

填空题