药品特殊性体现在 A．质量标准严格 B．消费者低选择性 C．需要迫切性 D．缺乏需求

I have a little brother who is 11 years this year. We get on well with each other and have had a good times together. Several days ago, I bought a book to him. The book is written by those which have won Nobel Prize and it aim to help children learn about the unknown world. Before I bought the book, I have read it. I felt that it is a good book for him, because he is interesting in new things and has so much questions. I hope that through reading book, my brother can learn more about the world and know how to do a good person.

下列运算符中，不能被重载的是

A．&&

B．!=

C．．

D．++

葡萄糖有α型和β型的之分，β型的甜味不如α型甜，前者仅是后者的（）。

A、0.06倍

B、1.67倍

C、0.67倍

D、16.70倍

大学图书馆员说：直到三年前，校外人员还能免费使用图书馆，后来因经费减少，校外人员每年须付100元才能使用我馆。但是，仍然有150个校外人员没有付钱，因此，如果我们雇用一名保安去辨别校外人员，并保障所有校外人员均按要求缴费，图书馆的收益将增加。
要判断图书馆员的话是否正确，必须首先知道下列哪一选项

A．每年使用图书馆的校内人员数。
B．今年图书馆的费用预算是多少。
C．图书馆是否安装了电脑查询系统。
D．三年前图书馆经费降低了多少。
E．雇用一名保安一年的开支是多少。

与原发性肝癌发病最密切的因素是（）

A.黄曲霉毒素

B.病毒性肝炎

C.肝硬化

D.饮用水污染

E.寄生虫