GWD20-27题求助

yeah529

A major chemical spilloccurred five years ago at Baker’s Beach, the world’s sole nesting ground for Merrick sea turtles, and prevented nearly all the eggslaid that year from hatching.  Yet thenumber of adult female Merricks
returning tolay their eggs at Baker’s Beach has actually increased somewhat since fiveyears ago.  Clearly, environmentalists’prediction that the world’s Merrick populationwould decline as a result of the spill has proven unfounded.Which of the following,if true, most seriously undermines the argument offered in refutation of theenvironmentalists’ prediction?

A.     The chemical spill five years ago occurred at a time whenthere were neither Merrick sea turtles nor Merricksea turtle eggs on Baker’s Beach.
B.     Female Merrick sea turtlesbegin returning to Baker’s Beach to lay their eggs when they are ten years old.
C.     Under normal conditions, only a small proportion ofhatchling female Merrick sea turtles survivein the ocean until adulthood and return to lay their eggs at Baker’s Beach.
D.     Environmental pressures unrelated to the chemical spillhave caused a significant decline in the population of one of the severalspecies of sea birds that prey on Merrick seaturtle eggs.
E.      After the chemical spill, an environmental group rejected aproposal to increase the Merrick sea turtlepopulation by transferring eggs from Baker’s Beach to nearby beaches that hadnot been affected by the spill.


答案是B。是因为10岁不算adult么。。-  -求解释。谢谢大家帮忙哇

yeah529

求助。。。

manxeon

10岁说明那些飞回来的成年母鸟早在spill发生之前几年就出生了，所以削弱了理由——增加的鸟不是spill发生以后出生的。