Reading: 富兰克林远征船队的铅中毒死亡。文章说，不是这样的，因为： 1. 罐头食物不可能有毒； 2. 没有接到同一时期的其他铅中毒船员的reports； 3. 可能是水清洁system的铅pipe让船员的饮用水有毒。 Listening: 1. 罐头实物可能是有毒的，因为员工很pressure时间紧迫，铅ran down into； 2. 铅中毒的症状比如头疼可能被认为是海上的common symptom； 3. 水清洁系统和饮用水系统是separately的，不可能是污染了饮用水。
The lecture refutes the view mentioned in the reading with strong supporting evidences presented, aiming to further prove that the crew in the Franklin expedition may have died from lead toxicity. Firstly, from the perspective of the food source, the professor states his doubt, because according to the lecture, the crew were in a rush when making preparations for the voyage and lead might have accidentally run down into the food source in the manufacturing process. Moreover, judging from the lack of report of toxic symptoms, the professor holds a different view, as the lecture further illustrates that the symptom after being poisoned by lead may have been mistaken for common symptoms on sea. Last but not least, on the point of lead pipes in the water cleaning system, the professor never fails to express his concern, because the system of drinking water and cleaning water were completely separated that it was impossible that the drinking water had got polluted by the lead pipes in the cleaning system. (168 words)
