GMAT/GWD 28-13-15

28-passage two

Carotenoids, a family of natural pigments, form an important art of the colorful signals used by many animals. Animals acquire carotenoids either directly (from the plants and algae that produce them) or indirectly (by eating insects) and store them in a variety of tissues. Studies of several animal species have shown that when choosing mates, females prefer males with brighter carotenoid-based coloration. Owens and Olson hypothesize that the presence of carotenoids, as signaled by coloration, would be meaningful in the context of mate selection if carotenoids were either rare or required for health. The conventional

(Line 15) view is that carotenoids are meaningful because they are rare: healthier males can forage for more of the pigments than can their inferior counterparts. Although this may be true, there is growing evidence that carotenoids are meaningful also because they are required: they are used by the immune system and for detoxification processes that are important for maintaining health. It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females. Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems, whereas males that are genetically resistant will use fewer carotenoids for fighting disease and will advertise this by using the pigments for flashy display instead.

28-13: Information in the passage suggests that which of the following is true of carotenoids that a male animal uses for detoxification processes?

A: They were not acquired directly from plants and algae

B: They cannot be replenished through foraging.

C: They cannot be used simultaneously to brighten coloration.

D: They do not affect the animal’s susceptibility to parasites.

E: They increase the chances that the animal will be selected as a mate.

这道题我选C，定位在文章最后一句

28-14: The passage suggests that relatively bright carotenoid-based coloration is a signal of which of the following characteristics in males of certain animal species?

A: Readiness for mating behavior

B: Ability to fight

C: Particular feeding preferences

D: Recovery from parasite infestation

E: Fitness as a mate

我的答案E

28-15: According to the “conventional view” referred to in lines 14-15 of the passage, brighter carotenoid-based coloration in certain species suggests that an individual

A: lives in a habitat rich in carotenoid-bearing plants and insects

B: has efficient detoxification processes

C: has a superior immune system

D: possesses superior foraging capacity

E: is currently capable of reproducing

我选D

大家一起来讨论啊

agree with you

同意水蓝27的答案
28-13 我的定位在倒数第二句: either for immune defense and detoxification or for attracting females

28-13 支持E

28-15,还在犹豫中

15题同意选D

The conventional >>

(Line 15) view is that carotenoids are meaningful because they are rare: healthier males can forage for more of the pigments than can their inferior counterparts

通常的观点认为，C的代表意义是：更健康的雄性体能通过捕食的方式获得更多的色素，（因此可以得到更多的C）

同意LZ答案:

另外13题刚开始也误选了E.其实仔细一看完题干:

Information in the passage suggests that which of the following is true of carotenoids that a male animal uses for detoxification processes

E.They increase the chances that the animal will be selected as a mate.

不同的讨论话题.得出E项其实是无关,用常考的文字对应原则可以排除.

恭喜你答对了！哈哈