The reading passage examines the topic that, environment pollutions, rather than attacks by predators are more likely the reasons for the declining of sea otter populations. The professor’s speech concerns with the same topic. However, she contends that environment pollution is more likely the explanation for the decreased otters, which is the opposite of what the reading passage says. And in the presentation, she offers lots of evidences to buttress her idea.
First, even though the reading passage indicates that water samples contain increased levels of chemical, which directly lead to the otters deaths for the reason that otters can't(尽量用cannot) fight against infections that threaten their life lives. The professor argues in the lecture that the pollution hypothesis will be weakened because no one can find death otters washing up on the Alaska beaches. That is not what we expect if pollutions give otters life-threatening infections. The fact that we can hardly find death otters proves the predator hypothesis.
Second, the reading passage states that pollutions have negative effects not only on the otter, but also on other sea mammals. However, the lecturer says that because human has preyed so much many whales that the orcas have to change their diets. Consequently, all the small sea mammals, including the sea lions and seals, are available for orcas.
Third, the professor believes that the amount of otters depends on the location they live while the reading passage claims (claim表主张意思时,后面好像不能直接名词,应该接that或者to be)the uneven pattern of otter decline.(这个你不知道你是否会有疑问,你再问我吧) The professor gives us details that otters living in the places where orcas can access easily decline greatly and ones in the place where orcas cant cannot get into do not decrease. She also points out the fact that orca is too large to get in to shallow and rocky areas to support her idea.
To sum up, the professor precisely finds the flaws in the reading passage, and compellingly(这个地方是不是应该用副词形式的啊?我没见过,所以不确定啊!) proves that environment pollutions instead of the predators cause the decline of sea otters in Alaska.
总结一下,Serena是不是刚练过gre的作文,感觉有些地方有点像。听力非常不错,几乎所有的内容都写出来了,厉害厉害,个别词汇有些小错误,稍加注意检查一下估计没有问题的! |