[单选题]下列关于危险化学品的储存过程中的安全技术的说法，错误的是()。
A.危险化学品应当储存在专门地点，不得与其他物资混合储存
B.互相接触容易引起燃烧.爆炸的物品及灭火方法不同的物品，应该分类储存
C.性质不稳定.容易分解和变质以及混有杂质而容易引起燃烧.爆炸危险的危险化学品，应该经常进行检查.测温.化验，防止自燃.爆炸
D.不准在储存危险化学品的库房内或露天堆垛附近进行试验.分装.打包.焊接其他可能引起火灾的操作

It is curious to note how slowly the mechanism of the intellectual life improves. Contrast the ordinary library facilities of a middle-class English home, such as the present writer is now working in, with the inconveniences and deficiencies of the equipment of an Alexandrian writer, and one realizes the enormous waste of time, physical exertion, and attention that went on through all the centuries during which that library flourished. Before the present writer lie half a dozen books, and there are good indices to three of them. He can pick up any one of these six books, refer quickly to a statement, verify a quotation, and go on writing. Contrast with the tedious un- folding of a rolled manuscript. Close at hand are two encyclopedias, a dictionary, an atlas of the world, a biographical dictionary, and other books of reference. They have no marginal indices, it is true, but that, perhaps, is asking too much at present. There were no such resources in the w
A. is written as a conclusion of the passage
B. seems to contradict the main idea of the passage
C. has no relation to the rest of the passage
D. appears to have some connection with the passage