4月14号,综合写作
Both the readingand listening passages deal with the same topic: the influence of the zebramussel immigration from eastern Europe to north America. The main idea of thereading passage is that the immigration of the zebra mussel has causedevastation to the native eco-environment, whereas the speaker argues againstthe points presented by the reading passage. First of all, thewriter claims that this unstoppable creature is shipped by human transportation.However, the professor opposes the writer’s argument, based on the assertionthat it is completely impossible for this thing to happen. He holds the opinionthat it is a natural process for the zebra mussel to travel across the oceanowing to the balance of water salinity. For example, the zebra mussel, thefresh water fish, will be no doubt to die when stepping into the salty waterarea. Secondly, asmentioned in the reading passage, the zebra mussel immediately domain the newhabitat and no other creatures can compete with it. However, the lecturermaintains that it is just a short-time situation. There should be other factorsthat may threaten the living of the zebra mussel. For instance, the birdsusually eat the zebra mussel a lot. Lastly, thewriter contends that it is very possible that the zebra mussel causes thedecrease of overall fish population. On the contrary, the professor points outthat although it do have a effect on the slashing numbers of these fishpopulation, some positive influence also exists. Here is a case in point, thedead of upper-water fish provide the bottom-water fish enough nutrition, andthus increase the number of bottom-water fish in the lake river.
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