首页
登录
职称英语
The most popular organic gem is the pearl. A pearl is the response of a mari
The most popular organic gem is the pearl. A pearl is the response of a mari
游客
2025-02-03
44
管理
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. [br] The difference between a pearl and a cultured pearl is the nature of the ______.
选项
A、color
B、introduction of the irritating impurity
C、coating material
D、irritating impurity
答案
B
解析
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。
转载请注明原文地址:https://tihaiku.com/zcyy/3940800.html
相关试题推荐
Themostpopularorganicgemisthepearl.Apearlistheresponseofamari
Themostpopularorganicgemisthepearl.Apearlistheresponseofamari
Themostpopularorganicgemisthepearl.Apearlistheresponseofamari
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
Electronicmailhasbecomeanextremelyimportantandpopularmeansofcommu
随机试题
WhatdowemeanbyaperfectEnglishpronunciation?Inone【C1】______therear
Manypeoplewonderwhysomemenwanttoliveonthemoon.Itis【1】nottheki
出版单位正确处理社会效益与经济效益关系的具体做法包括( )等。A.能带来丰厚利
Ihopeyouwillhavea_______weekwithu
执行管理层在审核了报给审计委员会的审计报告的有关结果后,同意接受不对某些审计发现
截流工程在戗堤全线上设置防渗体的工作,称为()。A.合龙 B.防渗 C.封
A.X线示梗阻性气肿及支气管周围炎 B.X线示中下肺野边缘不清,伴肺门团块状阴
一个设定标准、测量结果、评定是否达到预期要求,对质量问题采取措施进行纠正、补救,
实施技改专项行动,力争全年工业技改投资占工业投资比重达25%以上,带动工业投资完
根据增值税法律制度的规定,企业发生的下列行为中,不属于视同销售货物行为的是()。
最新回复
(
0
)