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
Two recent studies have confirmed the belief that size does matter, at least when it comes to cancer. The first builds on previo
Two recent studies have confirmed the belief that size does matter, at least when it comes to cancer. The first builds on previo
admin
2013-08-22
54
问题
Two recent studies have confirmed the belief that size does matter, at least when it comes to cancer. The first builds on previous evidence that being overweight is a major risk factor for breast cancer, and the second suggests that tall people are prone to a number of common cancers.
Our bodies contain trillions of cells that are constantly renewing or repairing themselves. Normal cells know where they are in the body, and behave appropriately. They grow and reproduce only when required, and self-destruct when they come to the end of their life. But, because of the problems in their software(DNA), cancer cells no longer respond to these normal signals and grow out of control.
Numerous mistakes are made during cell division every minute of every day and the body has natural defense systems to spot the damage and repair it, or kill the affected cells. The more cells you have, and the longer you live, the greater the odds of one of these mistakes slipping through. And that is without the external influence of carcinogens(诱癌因素).
Risk factors such as being overweight or taller than average are not direct carcinogens and it is often unclear why they increase the risk of cancer. The link with height may simply be down to taller people having more cells, meaning that there is more opportunity for things to go wrong. The link with obesity is likely to be more complex, but in the case of breast cancer it is thought that overweight women tend to produce more oestrogen(雌激素), a hormone(荷尔蒙)that can act as a "fertilizer" for some types of breast cancer.
Whatever the cause, the result is the same. Once enough mistakes have occurred for a cell to escape the body’s normal control mechanisms, it divides unchecked and a tumor(肿瘤)develops.
Will we have a cure? Probably not. But recent advances using drugs that target proteins in cancer cells to control their growth and spread suggest that we are about to enter an era when we may be able to slow and control cancer to such an extent that it will become a chronic(慢性的)disease that can be held in check.
What will happen if too much mistakes enable a cell to escape the control of the body?
选项
A、The cell will destroy itself.
B、The body will lose more cells.
C、The body will still be healthy and normal.
D、The cell will divide improperly to form a tumor.
答案
D
解析
根据题干关键词mistakes,a cell,control定位到第五段第二句:Once enough mistakes have occurredfor a cell to escape the body’s normal control mechanisms,it divides unchecked and a tumor develop.一旦错误足够多,细胞能逃离身体正常控制机制时,它就会未经检验而分裂,致使肿瘤形成。故D)项符合表述。B)项是原文的合理推断,故为答案。
转载请注明原文地址:https://kaotiyun.com/show/o507777K
0
大学英语四级
相关试题推荐
A、Sheisnotgoodatmakingfriends.B、Sheisnotwelloff.C、Sheenjoyscompany.D、Shelikestogotoconcertsalone.B短文中提到,帕特
A、Heisoutoftownallmorning.B、Heistiedupinfamilymatters.C、Hehasbeenwritingareport.D、Hehasgotmeetingstoatt
Inbringingupchildren,everyparentwatcheseagerlythechild’sacquisition(学会)ofeachnewskill--thefirstspokenwords,the
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstofloodwatersarevictimsnotjustofnaturebutofhuman
Asthesayinggoes,readingwithoutreflectingislikeeatingwithout______.
Domesticviolenceisaseriouscrimecausingserioussocialproblems.Itisviolenceathome,usuallythehusbandbeatinghiswi
Ashighschoolstudentsflocktosocialnetworkingsites,campuspolicearescanningtheirFacebookandMySpacepagesfortipst
Inrecentyears,therehasbeenanincreasingawarenessoftheinadequaciesofthejudicialsystemintheUnitedStates.Costsa
Thewaypeopleholdtothebeliefthatafun-filled,painfreelifeequalshappinessactuallyreducestheirchancesofeverattai
随机试题
缺失,双侧上颌结节过度增生,相应牙槽嵴骨尖,远中深龋,远中舌尖缺损,已做完善根管充填,不松动,智齿,近中阻生,牙石(+++)。上颌义齿戴用后,在静止和说话,打呵欠时固位均好,但咀嚼食物时义齿易脱位,应做的处理是
对世界银行来讲,项目完工报告应在()时准备,在贷款关账后()个月内完成。
关于期货交易所的合并、分立,下列说法正确的是()。
营业部处置突发事件应遵循的原则是()
根据《商标法》的规定,注册商标的有效期为10年,自( )算起。
实收资本的金额和企业注册资本的金额总是相等的。()
属于个别化教学的是()
结合材料回答问题:材料1国家主席习近平3月26日晚在北京出席二十国集团领导人应对新冠肺炎特别峰会并发表题为《携手抗疫共克时艰》的重要讲话:习近平强调,面对突如其来的新冠肺炎疫情,中国政府、中国人民不畏艰险,始终把人民生命安全和身体健康摆在第
设A=,则A一1=____________.
从网络使用者角度考虑,因特网是【 】网。
最新回复
(
0
)