2. 外语
  3. The most popular organic gem is the pearl. A pearl is the response of a marine mollusk to the presence of an irritating impurity

The most popular organic gem is the pearl. A pearl is the response of a marine mollusk to the presence of an irritating impurity

admin2006-07-14  51
问题     The most popular organic gem is the pearl. A pearl is the response of a marine mollusk to the presence of an irritating impurity accidentally introduced into its body; a cultured pearl is the result of the intentional insertion of a mother-of-pearl bead into a live mollusk. Whether introduced accidentally or intentionally, the pearl-making process is the same: the mollusk coats the irritant with a substance called nacre. Nacre is composed chiefly of calcium carbonate. Because very few natural pearls are now on the market, most pearls used in fine jewelry are cultured. These include "Biwa" pearls and most other freshwater pearls. Cultured pearls are not easily distinguished from natural pearls except by an expert.
What is the chief component of nacre?
选项 A、Sand.
B、Bead.
C、Calcium carbonate.
D、Biwa.
答案C
解析 见文章第四句：Nacre is composed chiefly of calcium carbonate．选项C．Calcium carbonate(碳酸钙)正确。
转载请注明原文地址:https://kaotiyun.com/show/FT5O777K
本试题收录于： CATTI三级笔译综合能力题库翻译专业资格（CATTI）分类
0

CATTI三级笔译综合能力

翻译专业资格（CATTI）

相关试题推荐
随机试题
最新回复(0)