天山 7-Q33-Q36

[小花]

天山-7-33～36另類海豹哺乳方式與眾不同

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
(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-7-35
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.

答案給E 從文章中的哪一部份可得知這個答案?

[souljazz]

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.

紅色標示部份意味著"在lactation perriod為fasting condition,而 答案(E)
說明了all phocids mothers' maternal strategy

[阿琪]

關鍵在此句
recent studies on harbor seals, a phocid species, found that (25) lactating females commenced foraging approximately 6 days after giving birth

明確表示…a phocid是在after giving brith 才開始foraging ( replenished their fat stores)

也可以參考看看之前討論過的囉！
http://www.formosamba.com/phpBB3/viewtopic.php?t=24874

[小花]

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