i choose D Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems,
-- by 会员 kathytc (2007/7/21 1:58:00)
agree! vote for D
-- by 会员 pennyrun (2010/2/16 17:58:29)
Males thatare more susceptible to disease and parasites will have to use their carotenoidsto boost their immune systems, whereas males that are genetically resistant willuse fewer carotenoids for fighting disease and will advertise this by using thepigments for flashy display instead.
13题 虽然either or表示的是两者居一，但是后面又说自身能免疫者仍然需要一些来免疫，只是fewer而不是none，因此对于自身能免疫的仍然需要依靠色素来保持排毒机能，而不是二者相排斥啊。 D应该没有问题吧，是否体现出排毒的色素只是自身能否直接免疫的结构，而不能影响动物能够免疫的原因 这是很明确的逻辑关系吧 E很明显是前文的结论，不是细节的结论 open to discuss
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发表于 2007-8-31 22:10:00
