首页
登录
职称英语
The pearl is a lustrous rounded gem formed inside a mollusk (软体动物) . Since
The pearl is a lustrous rounded gem formed inside a mollusk (软体动物) . Since
游客
2023-12-13
10
管理
问题
The pearl is a lustrous rounded gem formed inside a mollusk (软体动
物) . Since pearls may be formed by any shelled mollusk, the most valu- (1) ______
able pearls are obtained from the oysters. Except for imitation pearls, which (2) ___
are entirely man-made, all pearls are formed from a secretion (分泌物)
around an irritating body that enters the soft tissue of a mollusk.
If an irritating body enters the mollusk by accident, a natural pearl (3)______
forms. A cultured pearl forms if the irritating body is deliberately placed in
the mollusk by the man. (4)______
Unlike to other gems, pearls have a natural luster, and they do not need (5)______
to be polished. Although they are usually white or cream-colored, they may
also be any shade of pink, yellow, green, grey, or black. The most desirable
pearls are white with a creamy or pinkish cast. Black pearls are also very
valuable because of their scarce. (6)______
Imitation pearls are often made to appearing very similar to natural (7)______
pearls. Moreover, they do not have the luster of natural or cultured pearls. (8)______
Another way of distinguishing between imitation and natural or cultured
pearls is by gently rubbing the pearls through the surface of a tooth. Imita- (9)______
tion pearls feel smoothly, while natural or cultured pearls feel rough. (10)______ [br] (3)
选项
答案
an —the
解析
此题仍然是考查名词的所指问题。这里的irritating body在前一句中已经提到,所以此处应该是确定特指,那么必须用定冠词。
转载请注明原文地址:https://tihaiku.com/zcyy/3269952.html
相关试题推荐
Accordingtothenewresearch,theoddshapemoundswereformedby______.[br]
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
TheContinentalDivideisformedin.A、theAppalachianMountainsB、theRockyMou
Thepearlisalustrousroundedgemformedinsideamollusk(软体动物).Since
Thepearlisalustrousroundedgemformedinsideamollusk(软体动物).Since
Thepearlisalustrousroundedgemformedinsideamollusk(软体动物).Since
Thepearlisalustrousroundedgemformedinsideamollusk(软体动物).Since
随机试题
Theycallthemthenewbreadearners.Theyarewomen,andtheyaresettota
Researchershavediscoveredthatdolphinsareabletomimichumanspeech.A、impor
PASSAGEONEBoysandgirlshavedifferentincentivesinmathlearning.根据第3段第2、3句可
()房地产评估师()房地产经纪人[br]()销售经理()市场顾问A、D
工程中常利用电感、电容无功功率的互补特性,通过在感性负载端并联电容来提高电路的功
微生态制剂的作用特点包括()A:抑制肠内有害菌,维持人体微生态平衡 B:维持
《变电检测管理规定第5分册暂态地电压局部放电检测细则》:进行暂态地电压局部放电检
一个长方体实心零件,长、宽、高分别为12厘米、8厘米和4厘米。如将其最大面朝下放
下列哪一项属于商业银行面临的技术风险?()A.产品研发失败 B.外部经济周期或
建设单位未取得施工许可证或者开工报告未经批准,擅自施工的,责令停止施工,限期改正
最新回复
(
0
)