GMAT申友逻辑CR题库-In preparation for a large-scale tree-planting project, Thomasville has recorded the location, species, and condition of every tree in its-破解版12-真题答案解析

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In preparation for a large-scale tree-planting project, Thomasville has recorded

the location, species, and condition of every tree in its downtown area. The results will be compared with results of the last such tree census, taken 20 years ago. Planting trees primarily from the species that turns out to have the best record of survival will assure downtown Thomasville of an abundant tree population 20 years from now.

Which of the following, if true, most seriously undermines the claim that the tree-planting proposal will assure an abundant tree population?

A. Because of strict laws governing industrial development, environmental conditions in Thomasville are unlikely to become harsher for trees than they have been during the last 20 years.

B. Thomasville has reliable records to show which trees in existence 20 years ago were cut down to permit new construction downtown.

C. A number of trees from one of the species widespread in Thomasville 20 years ago reached the end of their natural life span in the intervening period.

D. Very few species of trees grow as well in urban conditions as in natural conditions.

E. A city with a high proportion of any one species of trees can have its tree population devastated by one outbreak of a disease.

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答案：

A 由于正在�

��强对工业的管制，树木以后的生长环境不会比过去20年差，即树木会获得更好的生长环境。---加强。 B 有详细的记录，关于20年前存在，但后来为城区建设而被砍倒的树木。---无关。因为无法判断被砍倒的树木可能有的生长状况，无助于预计未来树木生长状况。 C 20年前长势很好的树，现在到了生长年龄的极限了，即将死亡。也就是说马上会有一大片树木死亡。那未来还应该种这种树吗？还是种其他树？无法推断。 D 大部分的树在城市中不如在自然环境下长得好。---无关。 E 如果城市树木品种过于单一，那么这些树木一旦爆发疾病，就会大批死亡。---正确。我们知道，同种植物之间的病虫害是很容易传染，难以阻绝的；而同一种病菌却不容易在不同种植物间传播。因此，如果该市单一地种植在过去20年长得不错的树种，假使疾病爆发，则很有可能倒下大半，则an abundant tree population 20 years from now计划泡汤。