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求助,天山-RC 百思不得其解 题目原链接(这个链接字体偏小,于是把原题帖出来,这样看的清楚些) http://forum.chasedream.com/dispbbs.asp?boardid=25&id=84255&star=3#1782949 Until recently, zoologists believed that all species of phocids (true seals), a pin- nipped family, use a different maternal Line strategy than do otariids (fur seals and (5) sea lions), another pinniped family. Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after (10) birth. Throughout the rest of the lactation (milk production) period, which lasts from 4 months to 3 years depending on the species, mother otariids alternately for- age at sea, where they replenish their fat (15) stores, and nurse their young at breed- ing sites. Zoologists had assumed that females of all phocids species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy (20) stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species. However, recent studies on harbor seals, a phocids species, found that (25) lactating females commenced foraging approximately 6 days after giving birth and on average made 7 foraging trips during the remainder of their 24-day lactation period. (30) The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation. Harbor seals are small compared with other phocids (35) species such as grey seals, all of which are known to fast for the entire lactation period. Studies show that mother seals of these species use respectively 84 percent, 58 percent, and 33 percent of their fat (40) stores during lactation. By comparison, harbor seals use 80 percent of their fat stores in just the first 19 days of lactation, even though they occasionally feed during this period. Since such a large proportion (45) of their fat stores is exhausted despite feeding, mother harbor seals clearly cannot support all of lactation using only energy stored before giving birth. Though smaller than many other phocids, harbor seals are (50) similar in size to most otariids. In addition, there is already some evidence suggesting that the ringed seal, a phocids species that is similar in size to the harbor seal, may also use a maternal foraging strategy. T-7-33 It can be inferred from the passage that the females of all phocids species differ from the females of all otariid species in that the female phocids - have shorter lactation periods
- consume more food during lactation
- consume a higher proportion of fat stores
- forage for food occasionally during their lactation periods
- deplete a smaller percentage of their fat stores during their lactation periods
T-7-35 According to the passage, until recently zoologists believed which of the following about all phocids mothers? - Their fasting periods after giving birth were typically shorter than those of otariids.
- Their lactation periods were generally as long as those of comparably sized otariids.
- They acquired only moderate energy stores in the form of blubber before arriving at breeding sites.
- They depleted less than a third of their stored body fat during lactation.
- They replenished their fat stores only after their lactation period ended.
以下是引用xealot在2004-12-21 18:21:00的发言：The article has two major points: 1. The recent finding, line 1 to line 29 2. The explanation to the finding, line 30 to the end(line 56) So the two topics are well balanced, and thus in question 34, answer D is perferable to A. According to line 1 to line 23 of the article, the major difference between the two type of animals is whether they feed during their lactation. This is why we choose E in regards of quesiton 35. The A in quesiton 35 kind of beats about the bush and thus is somehow away from the point. Besides, the respective fasting periods are 5 to 11 days and 4 to 50 days -- that is-- we cannot assert that one is longer/shorter than the other. Regarding question 36, we cannot quickly rule out the option B as the example here is actually not a TYPICAL one. To support the conclusion the maternal strategy of such seal is related to the size of body, the author raises the example in which the similarly sized animal is mentioned and juxtaposes the two species of animals. And, I suggest read the article comprehensively enough and try to grasp what the author WANTS to manifest. Just feel free to post any further concerns here. Wish this helps. 35题同意(荧光标注部分) But,让我们回到33题,大家不觉得这两个题目的答案自相矛盾吗? 33,35题,考点都在原文第一段 既然"the major difference between the two type of animals is whether they feed during their lactation." 那么33题应该选D呀 请大伙指点
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