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 have difficulty identifying these ceils. B、They aren’t sure how these cells work. C、They’ve learned how to reproduce thes
A、They have difficulty identifying these ceils. B、They aren’t sure how these cells work. C、They’ve learned how to reproduce thes
admin
2010-07-14
28
问题
W: Ok, last night you were supposed to read an article about 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 themselves.
W: Ok. So can you tell us how the bones repair themselves?
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, because 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 ceils work, maybe they can find a way to make sure the second group of cells completely fills the hole in the bone tissue ever time. That’ll prevent the disease from every occurring.
选项
A、They have difficulty identifying these ceils.
B、They aren’t sure how these cells work.
C、They’ve learned how to reproduce these cells.
D、They’ve found similar cells in other species.
答案
B
解析
转载请注明原文地址:https://jikaoti.com/ti/NUMMFFFM
0
大学英语六级
相关试题推荐
In2004,ProfessorBaughmaninventedasuper-strong,super-lightmagicmaterialandhenamedit"mithril"—afterthepreciousa
In2004,ProfessorBaughmaninventedasuper-strong,super-lightmagicmaterialandhenamedit"mithril"—afterthepreciousa
By2030,peopleover65inGermany,theworld’sthird-largesteconomy,willaccountforalmosthalftheadultpopulation,compar
A、Theythoughttobuythingsbeforethepriceswentup.B、TheyboughtthingsbecausetheyrememberedtheGreatDepression.C、The
A、Shecan’taffordthetimeforthetrip.B、Shewillmanagetoleavethismonth.C、Shehastochangethetimeforthetrip.D、Sh
Whichonewillhelppeopletorecognizetheirownkeyrequirementsduringhuntingajob?Nowadaysemployersoftenaskquestions
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterprise,marketorientedeconomyinwhichconsumerslarg
A、Hedressesmoreformallynow.B、Whathewearsdoesnotmatchhisposition.C、Hehasignoredhisfriendssincegraduation.D、He
Urbanlifehasalwaysinvolvedabalancingofopportunitiesand【B1】______againstdangersandstress;its【B2】______forceis,in
A、ShecanspeakmanydialectsexceptforCantoneseandHokkien.B、ShehasneverlearnedCantoneseorHokkien.C、Shecanspeakne
随机试题
在“学生”报表中有一文本框控件,其控件来源属性设置为“=count(*)”,则正确的叙述是()。
设确定常数a的值使f(χ)在χ=0处连续。
Ⅲ度子宫脱垂患者,阴道脱出物的特点是
患者,女性,46岁,1天前进食大量烤肉后,突感上腹部剧烈而持续的疼痛,疼痛向腰背部呈带状放射,伴恶心、呕吐。入院后查血清淀粉酶为750U/L,考虑该患者所患疾病为
某建设项目工程费用5000万元,工程建设其他费用1000万元,基本预备费率为8%,年均投资价格上涨率5%,建设期两年,计划每年完成投资50%,则该项目建设期第二年价差预备费应为()万元。
以下物权的设立、变更、转让和消灭,未经登记,不得对抗善意第三人的有( )。
以房产投资收取固定收入、不承担经营风险的,应以出租方取得的租金收入为计税依据计缴房产税。()
小组结束期,组员的特性表现有()。
交换式局域网的核心设备是______,它可以在它的多个端口之间建立多个并发连接。
保证金比例通常为期货合约价值的()。
最新回复
(
0
)