A-A+
The difference between a pearl and a cultured
问题详情
The difference between a pearl and a cultured pearl is the nature of the ______.
A．color
B．introduction of the irritating impurity
C．coating material
D．irritating impurity
参考答案
正确答案：B
解析：细节题型。文章第二句(A pearl is the response of a marine…a live mollusk. )指出：天然珍珠中的刺激性的杂物是偶然进入体内的(accidentally introduced into its body)；而人工培育的珍珠中的杂物是人为加入的(the intentional insertion)；所以选项B正确。
