2018年5月6日
托福听力考试日期：
2018年5月6日
新托福听力题目回忆：
Lecture3
Why is the number of sea otters reduced?
The first guess was that the fertility rateof the sea otters was getting lower and lower, but the study found no; it wasguessed that the move could go somewhere else, but there was no, and why it wasless. The first is that the orcas preys on the sea otters. It was not foundbefore, but recently there are almost ten incidence, and the number of seaotters in where the whales can meet has been reduced, but the otter where thewhale is not touched is not changed, so it should be eaten by the killer whale.But why do the orcas eat sea otters? Scientists suspect that other food (seals,sea lions and so on) of the killer whale become less, so they begin to eat seaotters.
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