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B-证明个人品质I wonder if he did that trip for private reasons…wonder为猜测， 后多跟干扰信息，而女生观点认为更应该是试验主人公的理论，因此排除。

Q27，题干关键词most important，最高级表达为常见出题点。

答案句：The most important factor seems to have been that he use only ancient techniques(古代方法) and local materials(当地材料) to build his raft.对应C选项authentic method，真实，基础的方法，故答案为C。

干扰项分析：

A-此举第一人，音频：do you think it was important to him that he achieve it before anyone else did?...女生回答I haven’t read anywhere that that was his motivation(动机)，故排除。

B-越洋速度，音频只是客观陈述it took them 97days,并未对此概念进行评论。

Q28，题干关键词为why以及专有名词Easter Island.

答案句：But what he want to do was talk to the local people about their old stone carvings。转折后重点，其中stone carvings对应A选项stone statue石头雕像。故答案为A。