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
2024-01-02
11
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 main idea in this passage is that ______
选项
A、most marketable pearls are cultured because nature does not produce enough of its own to satisfy the market
B、cultured pearls are of a higher quality than natural pearls
C、there are two major methods of pearl-making
D、a natural "drought" of pearl production is taking place
答案
C
解析
阅读全文可知本文介绍了珍珠有天然和人工养殖两种形成方式;所以选项C正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3326242.html
相关试题推荐
Forthistask,youwillwritearesponsetoaquestionaboutareadingpassag
Forthistask,youwillwriteanessayinresponsetoaquestionthatasksyou
Forthistask,youwillwriteanessayinresponsetoaquestionthatasksyo
Forthistask,youwillwriteanessayinresponsetoaquestionthatasksy
Thechallengeofpredictingorganismalresponsestoglobalclimatechangeis
Moviesarepopularallovertheworld.Explainwhymoviesaresopopular.Us
"OrganicArchitecture"Oneofthemoststrikingpersonalitiesinthedevelopm
"OrganicArchitecture"Oneofthemoststrikingpersonalitiesinthedevelopm
"OrganicArchitecture"Oneofthemoststrikingpersonalitiesinthedevelopm
"OrganicArchitecture"Oneofthemoststrikingpersonalitiesinthedevelopm
随机试题
Itturnsoutthatagoodnight’srestisgoodforbusiness.One-thirdof
Thereismuchdiscussiontodayaboutwhethereconomicgrowthisdesirable.A
下列关于模板支架、脚手架拆除施工中表述错误的是()。A、采用机械作业时应由专人指
患者男性,44岁,在38℃高温的户外劳动后出现口渴、尿少、眼窝内陷、烦躁不安的症
企业各直线部门、职能部门或各组成部分及各类层级权责结构之间的指挥、服从、接受监督
根据《治安管理处罚法》的规定,下列情形可以执行行政拘留处罚的是()。A.
药师在审查过程中发现不合理处方,应该A.拒绝调配处方 B.调配处方并发药 C
某企业拟建立一项基金,为了使五年后该项基金本利和达到671561元,若利率为10
共用题干 2013年9月,甲公司发生如下业务:(1)向乙公司购买一批钢材,甲公
A.中央前回 B.黑质-纹状体 C.颞叶 D.枕叶 E.小脑帕金森病病损
最新回复
(
0
)