托福听力official32 What can be inferred from paragraph 3 about the reason that large seeds are dispersed by birds or small animals rather than by wind? 答案解析

用large seeds可定位到原文第3句，但是，第三句不足以用来推测，还需结合讨论seed传播方式的第二句话，这两句话将小种子和大种子传播方式做了介绍：Many plants depend on wind for dispersal and produce abundant quantities of small, relatively short-lived seeds to compensate for the fact that wind is not always a reliable means of reaching the appropriate type of habitat. Alternative strategies have evolved in some plants, such as those that produce fewer but larger seeds that are dispersed to suitable sites by birds or small mammals or those that produce long-lived seeds.这两句话的主要内容是：小种子通常靠风传播, 大种子由鸟和动物实现传播。而在说道风这个传播媒介是，提到它的特性是not reliable的。后面就接着说大种子依赖其他的途径传播，言下之意就是大种子太重了，风很难传播。那么就和B选项的内容呼应。