首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、They break down bone tissue. B、They defend the bone against viruses. C、They connect the bone to muscle tissue. D、They prevent
A、They break down bone tissue. B、They defend the bone against viruses. C、They connect the bone to muscle tissue. D、They prevent
admin
2013-05-19
24
问题
W: Ok, last night you were supposed to read an article a bout human bones. Are there any comments about it?
M: Well, to begin with, I was surprised to find out there was so much going on in bones. I always assumed they were pretty lifeless.
W: Well, that’s an assumption many people make. But the fact is bones are made of dynamic living tissue that requires continuous maintenance and repair.
M: Right. That’s one of the things I found so fascinating about the article the way the bones repair them selves.
W: Ok. So can you tell us how the bones repair them selves.
M: Sure. See, there are two groups of different types of specialized cells in the bone that work together to do it. The first group goes to an area of the bone that needs repair. This group of cells produces the chemical that actually breaks down the bone tissue, and leaves a hole in it. After that’ the second group of specialized cells comes and produces the new tissue that fills in the hole that was made by the first group.
W: Very good. This is a very complex process. In fact, the scientists who study human bones don’t completely understand it yet. They are still trying to find out how it all actually works. Specifically, be cause sometimes after the first group of ,cells leaves a hole in the bone tissue, for some reason, the second group doesn’t completely fill in the hole. And this can cause real problems. It can actually lead to a disease in which the bone becomes weak and is easily broken.
M: Ok, I get it. So if the scientists can figure out what makes the specialized cells work, maybe they can find a way to make sure the second group of cells completely fills the hole in the bone tissue every time. That’ll prevent the disease from ever occurring.
选项
A、They break down bone tissue.
B、They defend the bone against viruses.
C、They connect the bone to muscle tissue.
D、They prevent oxygen from entering the bone.
答案
A
解析
细节题。从短文中The first group goes to an area of the bone that needs repair.This group of cells produce the chemical that actually breaks down the bone tissue,and leaves a hole in it.可知第一组特殊细胞的功能是“产生能破坏骨组织,在骨组织中空留一个洞的化学物质”,A选项正确。
转载请注明原文地址:https://kaotiyun.com/show/IIg7777K
0
大学英语四级
相关试题推荐
Onthenightoftheplay,Albertwasalreadymade-upand【B1】______inhispoliceman’suniformlongbeforetheendofthefirstac
Onthenightoftheplay,Albertwasalreadymade-upand【B1】______inhispoliceman’suniformlongbeforetheendofthefirstac
Forthispart,youareallowed30minutestowriteacompositionentitledMyMostUnforgettableTeacher.Youshouldwriteatlea
TheHumanBrainThebrainisthemostcomplexorganinhumanbody.Itproducesoureverythought,action,memory,feelingan
TheyoungCouplewerequiteexcitedbythe______ofhavingtheirfirstchild.
Schoolshootingsareinthenewsagain.AnOhioteenageropenedfireonfiveclassmates,killingthreestudentsandinjuringtwo
Claysuggestsgoingthroughthein-boxessystematicallyandthoroughlyeverymorning,andlessoftenifnecessary.Somecompani
Thefieldofmedicinehasalwaysattracteditsshareofquacks(庸医;江湖医生).Themasonswhyquackerythriveseveninmoderntimesa
A、Sheneedsmorepractice.B、Sheshouldn’tbesoambitious.C、Sheisverygoodatherstudy.D、She’dbettertakecareofherhea
A、Thewomanswimsaswellashedoes.B、Hedoesn’thavetimetoteachthewomantoswim.C、Hedoesn’tenjoyswimming.D、Helearn
随机试题
最高人民法院《关于贯彻执行(中华人民共和国民法通则)若干问题的意见》第185条规定,当事人有两个以上营业所的,_____。
项王身亦被十余创。被:创:
若函数f(x)=5x,则f′(x)=【】
罗威纳犬,雌性,2岁,36kg,激烈训练后,突然出现精神沉郁,呆立,弓腰,干呕,呻吟,口吐白沫,卧地不起,呼吸急促,可视黏膜苍白,腹围迅速增大,腹部叩诊呈鼓音。该病最可能诊断是
受《执业医师法》调整的人中,不包括
以下不属于事故原因分析基本步骤的是()。
某企业从设备租赁公司租借一台设备,该设备的价格为48万元,租期为6年,折现率为12%。若按年金法计算,则该企业每年年末等额支付和每年年初等额支付的租金分别为()万元。
Whatismentionedabouttheprinter?
ReadtheextractbelowfromAccountingBusinessOutsourceProcess.Inmostofthelines(34-45),thereisoneextraword.Itise
Allthepeopleinthestadiumcheeredupwhentheysawhundredsofcolorfulballoons______slowlyintothesky.
最新回复
(
0
)