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可达GWD阅读题目翻译100篇
可达亲译 :GMAT 阅读100 篇
乌鸦
(1) Ravens display many sophisticated
behaviors in the wild. (2) Experiments
suggest that these behaviors result partly
from Logical reasoning, not merely from
instinct or rote learning. (3) In one
experiment, ravens were presented with food
hanging on a string. (4) To get the treat, a
raven had to repeatedly reach down from its
perch and pull up the string with its beak,
stepping on the string after each pull to
prevent slippage. (5) Some ravens examined
the situation for several minutes and then
quickly performed this multistep procedure
on their first try, without any preliminary
trial and errors. (6) Since the ravens would
not have previously encountered this
situation in the wild, they could not have
learned it through past experience. (7)
Hence, they apparently imagined
possibilities and reasoned out what steps to
take.
(1) In operant behavioral conditioning of
laboratory animals, each step in a desired
behavioral sequence is typically rewarded
with food. (2) Thus, the animal can learn
each step without understanding how it
contributed to the overall outcome of the
behavioral sequence. (3) But no one step in
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