单选题 A certain type of dinnerware made in Ganandia contains lead. Lead can leach into acidic foods, and Ganandians tend to eat highly acidic foods. However, the extreme rarity of lead poisoning in Ganandia indicates that the dinnerware does not contain dangerous amounts of lead.
Which of the following, if true, most seriously weakens the argument above?

A、 The dinnerware is produced exclusively for sale outside Ganandia.
B、 Ganandian foods typically are much more acidic than foods anywhere else in the world.
C、 The only source of lead poisoning in Ganandia is lead that has leached into food.
D、 Most people who use the dinnerware are not aware that it contains lead.
E、 (E) Acidic foods can leach lead from dinnerware even if that dinnerware has a protective coating.

【正确答案】 A

【答案解析】[解析] 本题推理重点在最后一句话，并且however也指引了读题重点，那么weaken应重点，weaken最后一句话。而最后一句话是用“Ganandia铅中毒事件极少”这一事实而得出结论“餐具不含有达到危险水平的铅”，属于推理的“B，A”型，思维重点应转向用“除了A之外有别的原因影响B”，而(A)指出生产的晚餐用具全部在Ganandia以外销售，指出了A之外的另外一个原因，所以(A)正确。