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Consider three fish swimming together in a school. The space within each fish can be seen by predator Y is defined by a sphere centered on the fish and having a radius that is the maximum distance Y can see. The school is vulnerable to attack when Y is within one of the three spheres. The spheres overlap to a great extent, since the fish are in a compact group.
Which of the following is a reliable inference to be drawn from the passage above?
A The vulnerability to attack of the school as a whole is not much greater than the vulnerability to attack of any one fish in the school.
B There is less chance that predator Y will attack a school of four fish than that it will attack a school of three fish.
C Fish who swim in schools are less likely to be devoured by predators than are fish who do not swim in schools.
D The maximum distance at which an individual fish is visible depends less on the size of the fish than on whether the fish is swimming in a school.
E The maximum distance at which predator Y can see its prey is increased if Y is itself swimming in a school of Y's.
句子好像是很简单，可我还是不明白什么意思。。。谁给解释一下 |
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发表于 2009-11-25 21:43:45
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