题目解析:
A选项的quality of work定位到第四段的第一句话:
...especially when complaints were heard in the latter sixteenth century that the standards and traditions of the Arsenale were running down.
这句话的runnning down和A选项的decline呼应,所以A不选;
B选项用heavy和inefficient定位到第三段最后一句话:
Venice clung to its outdated standard while the Dutch were innovation in the lighter and more easily handled ships.
这里拿Venice的船和Dutch的工艺对比,显出Venice船的中和难操作。和B选项对应,所以B不选。
C选项的worked more slowly定位到第四段第二句话:
Work was stretched out and done poorly.
这里强调了工作拉长了,也就是速度慢了,所以C正确,不选。
D选项的buying和selling定位,发现原文无提及,所以选D。