求教T-4-26:T-7-35

xiaojingzi1015

Until recently, zoologists believed that all species of phocids (true seals), a pin-nipped family, use a different maternal strategy than do otariids (fur seals and     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 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 forage at sea, where they replenish their fat stores, and nurse their young at breeding sites. Zoologists had assumed that females of all phocids species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy 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 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.
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 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 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 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 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-4-26:T-7-35 B D
According to the passage, until recently zoologists believed which of the following about all phocids mothers?
A.    Their fasting periods after giving birth were typically shorter than those of otariids.
B.    Their lactation periods were generally as long as those of comparably sized otariids.
C.    They acquired only moderate energy stores in the form of blubber before arriving at breeding sites.
D.    They depleted less than a third of their stored body fat during lactation.
E.    The replenished their fat stores only after their lactation period ended.

这道题纯粹胡选的  不懂  在原文找不到答案  NN指点一下吧

xiaojingzi1015

大家帮帮忙啦  

ozymendias

帮忙顶，同问。E是怎么出来的？

xiaojingzi1015

楼上的  这题选D啊

ozymendias

啊？我的答案上选得是E。。。不过不管是D还是E都想知道是怎么出来的

ozymendias

ozymendias

ozymendias

顶

xiaojingzi1015

Zoologists had assumed that females of all phocids species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period,
那个单词是绝食 的意思  LS你的答案是对的  是E

ozymendias

um， fast我知道是绝食的意思，但是题干中的until recently是重点啊。。。until recently就是说明“直到最近，动物学家才。。。”说明是zoologist的新观点
而楼主所引用的“Zoologists had assumed ”却是表示zoologist的老观点啊。。