托福阅读材料：海水盐度
出国留学网托福考试频道为各位考生提供托福阅读、托福阅读真题、托福阅读预测、托福阅读模拟、托福阅读机经等各关于托福阅读复习考试资料，更多托福阅读资讯，快来关注出国留学网吧。 Question 41-50 If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are i...