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The material traditionally used for make kettles in which water for teas is boiled is
iron. When water is brought to a boil in these tea kettles, minute traces of iron
dissolve in the water. These trace amounts of iron affect the taste of the tea. The
use of tea kettles made of nontraditional materials that do not dissolve in water
would therefore generally improve the taste of the tea.
Which of the following is an assumption on which the argument depends?
B Iron from kettles is the only impurity that is found frequently in water usedfor tea.
C Trace amount of dissolved iron do not improve the taste of tea.
答案是C,我感觉B也差不多啊,说铁是唯一的杂质。那去掉铁不就能improve taste了吗
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