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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 passage implies which of the following about the B. alicastrum trees observed in Veracruz?
选项 A、They are a product of selective breeding.
B、Their development has been influenced by bat behavior.
C、They bear an inferior quality of fruit.
D、They are poorly suited to the growing conditions at Veracruz.
E、They diffuse significantly from the trees at Tikal in their genetic makeup.
答案E
解析 根据文章最后一句，季卡尔的树和韦拉克鲁斯的树在生长环境方面几乎一样，但是季卡尔的树生产力更强，这说明两者的基因组成不同，选项E正确。
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