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
2024-12-25
33
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:http://tihaiku.com/zcyy/3884510.html
相关试题推荐
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
LangstonHughesandHisWork:InsideandOutI.GeneralIntroductionofLangston
Thepearlisalustrousroundedgemformedinsideamollusk(软体动物).Since
Thepearlisalustrousroundedgemformedinsideamollusk(软体动物).Since
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
Theexaminerasksthecandidateabouthim/herself,his/herhome,workorstudies
BrownlowHall,aVictorianmansionjustoutsideSouthDean,wastotallydest
—"WhencanIcomeforthephotos?Ineedthemtomorrowafternoon."—"They_____
焊前对焊工重点审查的项目是()。A、年龄 B、焊接资格 C、技术等级 D、
Thechangeinthatvillagewasmiraculou
根据《火灾自动报警系统设计规范》GB50116—2013的规定,安全出口指示标志
美国教育家德怀特·艾伦曾说过:“如果我们使学生变得聪明而未使他们具备道德性的话,
简述教育发挥主导作用的条件。
甲公司期末存货采用成本与可变现净值孰低计量,2×19年12月31日甲公
在特别潮湿的场所、导电良好的地面、锅炉或金属容器内工作的照明电源电压不得大于(
最新回复
(
0
)