2. 外语
  3. Unlike herbivores and omnivores, predators have traditionally been thought not to balance nutrient intake because of the assumpt

Unlike herbivores and omnivores, predators have traditionally been thought not to balance nutrient intake because of the assumpt

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问题     Unlike herbivores and omnivores, predators have traditionally been thought not to balance nutrient intake because of the assumption that animal tissue as a food source varies little and is nutritionally balanced. But chemical analysis of invertebrate prey reveals remarkable variation in nutrient composition among species; even within species, nutrient composition may vary considerably. Greenstone suggested that predators may select food items according to their nutrient contents. Jensen et al (2011) have shown experimentally that even sit-and-wait invertebrate predators with limited mobility can work to address nutrient deficiencies. The wolf spider, for instance, has been shown to regulate nutrient intake by extracting more dry mass from a prey item if it contains a higher proportion of a nutrient that was deficient in the previous prey.
The passage supplies information for answering which of the following questions?
选项 A、Do invertebrate predators with full mobility address nutrient needs in the same fashion as sit-and-wait invertebrate predators with limited mobility?
B、Why would there be a considerable variation in nutrient composition within prey of a given species?
C、Is all of the nutrient content of invertebrate prey contained in the dry mass?
D、What would a wolf spider do if a fly it was eating contained a higher proportion of a certain nutrient than was present in the spider’s recent prey?
E、How is a wolf spider able to determine that some prey it is eating contains a higher proportion of a nutrient that was deficient in the previous prey?
答案D
解析 这种问答类的题目需要注意选项是一般疑问句还是特殊疑问句。如果是一般疑问句，那么根据文章能用yes或no回答的，都可以选。但如果是特殊疑问句，一定要根据原文得到具体的回答才能选。D项正确，根据文章第五句话，狼蛛会从这只猎物中提取更多的干物质。A项文章没提到predators with limited mobility。B项文章没有回答why的问题。C项根据文章我们只知道干物质中有营养，但不知道是不是所有营养都在干物质里。E项文章看不出狼蛛判断营养含量的具体方式。
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