独立写作题目：
作文题目： Some people always follow their dreams even if the dreams are ambitious. Some think we should focus on achieving realistic goals. Which do you agree with? Why?
Topic 议题：Alaska orca和Iceberg orca是不是同一条逆戟鲸
Thesis 总论点
Reading：The Alaska orca and the Iceberg orca are different individuals.
Listening：Refute the three explanations mentioned in reading passage.
Sub-point 1
分论点1
Reading：The Alaska orca and the Iceberg orca have slight coloration difference.
Listening：The lecturer refutes the point by saying that orcas will alter their colors in different seasons, thus it is not wise to say they are different orcas just according to the color.
Sub-point2
分论点2
Reading：The habitats of the Alaska orca and the Iceberg orca are too far away, so they are not the same orca.
Listening：According to hunting habitat, orcas can be divided into two kinds. One just preys along the coast, and the other feeds on fish groups and always travels far distance.
Sub-point 3
分论点3
Reading：The Alaska orca and the Iceberg orca are of different age.
Listening：Orcas’s fins tend to keep same from approximately 20 years old. So the fin alone can not tell that two orcas are different individuals.
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