17. Although the population of a certain salmon species in the Pleasant River
has not decreased in the last five years, the average size of adult female
salmon of that species in the river has decreased significantly in this time.
The latter fact indicates that the population of this species is ultimately
endangered, since small fish of a given species lay far fewer eggs than
do large fish of the same species.
Which of the following is an assumption on which the argument depends?
A Excluding fish of the salmon species, the average size of fish in the
Pleasant River has increased over the past five years.
B The largest adult female salmon living in the Pleasant River five
years ago were significantly larger than the largest adult female
salmon living there now.
C Smaller salmon are not an easier prey for salmon predators than are
larger salmon.
D The total number of eggs laid each year by salmon of the species
in the Pleasant River has not varied significantly over the past five
years.
E The proportion of the eggs laid by small salmon of the species that
hatch into fish that reach reproductive maturity is not significantly
greater than that of the eggs laid by large salmon of the species.作者: Louisa_xy 时间: 2003-1-20 14:27
D
population 在过去5年没有减少-产卵数量没有什么变化， 虽然adult female的体形变小。作者: steven.wei 时间: 2003-1-20 18:33
l5
hi Louisa_xy
真高兴收到回信。来了好几次，除了回家过年外没人。有一种无人喝采感觉油然而升。
这题答案是E，是不是ETS想用一种排除他因（not+weaken)方式来假设？对于答案大家不用怀疑，它们来自PP2。还请大家一起讨论。
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