标题: a LR question [打印本页] 作者: chasingd2012 时间: 2012-1-5 12:06 标题: a LR question 原题是: Mature white pines intercept almost all the sunlight that shines on them. They leave a deep litter that dries readily, and they grow to prodigious height so that, even when there are large gaps in a stand of such trees, little light reaches the forest floor. For this reason white pines can't regenerate in their own shade. Thus when in a dense forest a stand of trees consists of nothing but mature white pines, it is a fair bet that_____
Which one of the following most logically concludes the argument?
正确选项是(A): the ages of the trees in the stand don't differ from each other by much more than the length of time it takes a white pine to grow to maturity.