Sample answer:
The writer and the speaker have a debate on the owner of the negative. The writer points out that negatives belong to Adam, which is opposed by the following lecture.
First, the writer claims that the pine tree in this photo is as same as another tree appearing in the photo taken by Adam. while the speaker views this issue from an opposite angle. According to him/her, The pine tree in national park is very popular. Many people would take photos there, so it may not be taken by Adam.
Secondly, the writer states that the negative is in an envelope，which has his wife ’ s handwriting. However, the speaker casts doubt on this opinion by saying that There are some spelling mistakes. His wife is really familiar with that place, so she would not make such errors.
Last, the writer argues that the negative is damaged by fire. It is reported that the office of Adam once got fire. By contrast, in accordance with the speaker, this claim does not hold water. It is because the negatives contain the chemical substance which is highly likely to catch fire.
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