问题 问答题 简答题

简述天然宝石的族、种、亚种的划分。

答案

参考答案:

族—指化学组成类似、晶体结构相同的一组类质同象系列宝石。如石榴子石族、辉石族等。

种—指化学组成和晶体结构相同,外观相近的宝石。

亚种—是种的进一步细分。指同一个种的宝石,因化学组成中的微量组分不同,从而在外观上有较明显的变化,如蓝宝石中的黄色蓝宝石。

B.天然宝石按价值和稀缺程度的划分:

①高档宝石:钻石、祖母绿、红宝石、蓝宝石、金绿宝石(变石、猫眼);

②中低档宝石(常见宝石);

③收藏宝石:比如塔菲石,产自斯里兰卡,有米黄、淡紫、淡红等色,产量很少,市场知名度不高。

单项选择题 A1/A2型题
完形填空
I am a mother of three and have recently completed my college degree. My teacher’s last  36  of the term was called “ Smile”. I am a very friendly person and always  37  at everyone. So I thought this would be very  38 .
Soon after we were given the project, my  39  went out to McDonald’s. We were waiting to be  40 , when all of a sudden everyone around us began to  41 , and even my husband did. There standing behind me were two homeless men  42 .
As I looked down at the short gentleman with  43  eyes, he said, “Good day.” The second man stood behind his friend. I  44  the second man was mentally challenged(智障) and the blue-eyed gentleman was his helper.
The young  45  at the counter asked him what they wanted.
He said, “Coffee is all, Miss.” Because that was all they could  46 .
I smiled and asked the young lady to give me two more breakfast meals on a  47  tray(托盘). I then said to the men, “ I did not do this for you. God is here  48  through me to give you hope.”
When I joined my husband, he smiled at me, saying, “That is  49  God gave you to me, Honey, to give me hope.”
I returned to  50  with this story in hand. I  51  “my project” and the teacher read it. Then she looked up at me and said, “Can I  52  this with the class?”
I slowly  53  and she began to read and that was when I knew that we, as human beings, share this to help people and to be  54 .
In my own way I had  55  the people at McDonald’s, my husband, sons, teacher, and every person that shared the classroom on the last night I spent as a college student.
小题1:
A.questionB.projectC.classD.expression
小题2:
A.smileB.laughC.lookD.stare
小题3:
A.difficultB.funnyC.importantD.easy
小题4:
A.teacherB.classmatesC.familyD.children
小题5:
A.orderedB.servedC.paidD.called
小题6:
A.run awayB.crowd inC.shout outD.move away
小题7:
A.in surpriseB.in silenceC.in ragsD.in fear
小题8:
A.tearfulB.blueC.closedD.black
小题9:
A.realizedB.acceptedC.permittedD.admitted
小题10:
A.helperB.gentlemanC.ladyD.friend
小题11:
A.drinkB.wantC.takeD.afford
小题12:
A.big B.separateC.flatD.round
小题13:
A.workingB.goingC.gettingD.carrying
小题14:
A.howB.whenC.whereD.why
小题15:
A.collegeB.homeC.churchD.McDonald’s
小题16:
A.put upB.handed outC.handed inD.put away
小题17:
A.publishB.shareC.copyD.keep
小题18:
A.turnedB.leftC.shookD.nodded
小题19:
A.forgivenB.thankedC.helpedD.remembered
小题20:
A.touchedB.knewC.forgotD.recognized