题型分类：事实信息题

题干分析：关键词mapping，nest sites；根据关键词定位到第四段第二句：So as one of the first steps in their study, they mapped the distributions of trees suitable for nesting. 看到So表示结果，往前一句定位：Though Hubbell and Johnson were interested in how bee behavior might affect colony distributions, they recognized that the availability of potential nest sites for colonies could also affect distributions. 大意是：H和J认为巢穴地点也可能影响分布，所以他们就定位了巢穴地点。

选项分析：

A选项：来确定巢穴的可用性会不会影响殖民地分布，正确。

B选项：来得知这些蜜蜂的位置，属于无中生有。

C选项：确保合适的巢穴到处都有，和they found that potential nest trees were distributed randomly through the study area相悖，而且这也不是他们的目的，属于无中生有。

D选项：来看是不是不同的蜜蜂喜欢不同的巢穴地点，属于无中生有。