关于一般滴眼剂描述正确是（）
A.不得含有铜绿单胞菌和金黄色葡萄球菌
B.通常要求进行热原检查
C.不得加尼泊金、三氯叔丁醇之类抑菌剂
D.适当减少黏度，可使药物在眼内停留时间延长
E.药物只能通过角膜吸收
参考答案：A
解析：一般滴眼剂（即用于无眼外伤的滴眼剂）要求无致病菌（不得检出铜绿假单胞菌和金黄色葡萄球菌）。对热原不像注射剂要求检查。滴眼剂是一种多剂量剂型，病人在多次使用时，很易染菌，所以要加抑菌剂，使它在被污染后，予下次再用之前恢复无菌。增加粘度可使药物与角膜接触时间延长，有利于药物的吸收。药物溶液滴入结膜囊内后主要经过角膜和结膜两条途径吸收。所以答案为A。
Leif Erickson reached North America around the year 1000, but the attempt to explore was started slowly. It would be five centuries __1__ other Europeans landed on that continent. Why were Europeans the ones to __2__ to the American? The Chinese and Arabs had the __3__ and technology to sail across the seas. __4__ of them tool regular voyages in the Indian Ocean and the Asian Pacific for trade. But exploration? By the mid-15th century China had followed the closed-door policy to __5__ itself from the rest of the world. The Arabs, with access to the minerals and spices (香料) of Africa and the Far East, saw no __6__ to journey into the unknown. Europe, on the other hand, needed gold and silver; its mines could not __7__ the demand for coinage (铸币). Ottoman Turks blocked the routes across the land to Asia. Only the sea held the promise of new wealth. __8__ the return of Magellan’s ships in 1522 from its voyage around the world, the belief was __9__ that the oceans were interconnected, promising the age of discovery. The English, as well as the Spanish, Portuguese and French, __10__ themselves to finding the “river of the west” through North America to the east.
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