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问题 单项选择题

以下符合需氧脱氢酶的是

A．该类酶有时也可以称为氧化酶
B．它们全部是非黄素蛋白类
C．一般都以NAD或NADP作为受氢体
D．细胞色素C氧化酶属于需氧脱氢酶

答案

参考答案：A

解析：需氧脱氢酶有时也可以称为氧化酶。

单项选择题 案例分析题

In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words（1）which we become acquainted in daily conversation, which we（2）,that is to say, from the（3） of our own family and from our familiar associates, and（4） we should know and use （5 ）we could not read or write. They （6） the common things of life, and are the stock in trade of all who （7） the language. Such words may be called“popular”, since they belong to the people （8） and are not the exclusive （9） of a limited class. On the other hand, our language （10） a multitude of words which are comparatively （11） used in ordinary conversation. Their meanings are known to every educated person, but there is little （12） to use them at home or in the market-place. Our （13） acquaintance with them comes not from our mother's （14） or from the talk of our school-mates, （15） from books that we read, lectures that we （16） ,or the more （17）conversation of highly educated speakers who are discussing some particular （18） n a style appropriately elevated above the habitual（19） f everyday life. Such words are called“learned”, and the （20） between them and the“popular”words is of great importance to a right understanding of linguistic process.

请在14处填上正确答案（）

A.tips

B.mouth

C.lips

D.tongue
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单项选择题

下列哪种食物蛋白质质量最好（）

A.大豆

B.猪肉

C.鱼类

D.鸡蛋
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