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  3. The occurrence of dense aggregations of the fruit-bearing tree Brosimum alicastrum on or near Maya ruin complexes in Central Ame

The occurrence of dense aggregations of the fruit-bearing tree Brosimum alicastrum on or near Maya ruin complexes in Central Ame

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问题     The occurrence of dense aggregations of the fruit-bearing tree Brosimum alicastrum on or near Maya ruin complexes in Central America was initially interpreted as evidence of ancient Maya silviculture, i.e., the stands were relics of orchards planted by the Maya. Later work, however, suggested that the stands resulted from the Artibeus bats that roost among the ruins. The bats fly to the forest, collect the fruit, bring it back to their roost, eat the fruit, and then discard the undamaged seed. The continual input of bat-dispersed seed has maintained the clumps of B. alicastrum around ruins for many hundreds of years.
    This observation, however, does not negate the possibility that B. alicastrum was used and managed by the Maya. In fact, if we examine the behavior, rather than the density or location, of these tree populations, we are presented with strong evidence of deliberate genetic improvement. This is especially notable in the B. alicastrum trees that cluster around the Maya ruins at Tikal in Guatemala: these trees’ productivity is almost twice that of trees in Veracruz, Mexico, under almost identical environmental conditions.
“The continual input of bat-dispersed seed” is mentioned in the passage as part of an explanation for
选项 A、the productivity of certain stands of B. alicastrum
B、the presence of stands of B. alicastrum in certain locations
C、the displacement of fruit trees from Maya orchards
D、changes in the appearance of Maya ruins
E、changes in the forest around Maya ruins
答案B
解析 蝙蝠播撒种子这一信息就是作者给出的关于面包树分布范围的一种解释，故选项B正确。
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