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
Scientists have learned more about the way cancer spreads from one place in the body to another. Once it spreads, it gets more d
Scientists have learned more about the way cancer spreads from one place in the body to another. Once it spreads, it gets more d
admin
2010-06-01
15
问题
Scientists have learned more about the way cancer spreads from one place in the body to another. Once it spreads, it gets more difficult to【B1】______.
Cancer is a disease of uncontrolled .cell growth. 【B2】______thinking is that cells simply break off the main cancer, travel through the blood and grow in other organs.
But the new【B3】______ suggest there is more to this process. Researchers found that cells from the main tumor send out messengers. These prepare the new organ for a【B4】______ tumor.
It works this way. The primary tumor releases proteins called growth factors into the blood. They【B5】______ cells at the target organ to produce a sticky protein, called fibronectin. Fibronectin attaches to the surface of bone marrow cells. The result is a kind of【B6】______ area for cancer to arrive and grow into a secondary tumor.
The bone marrow cells help make vessels for blood to pass through and【B7】______ the cancer cells. The researchers believe that without the bone marrow cells, the tumors could not land on the new【B8】______ and grow.
Scientists from Cornell University in Ithaca, New York, led the research. It involved laboratory mice.【B9】______. The mice were then injected with lung cancer cells. The researchers were surprised when the bone marrow cells reached the lungs days before any cancer cells. They found that the bone marrow cells arrived to prepare the lungs for the cancer to spread. Other tests led to similar findings.
【B10】______. They say knowledge of the process could lead to new ways to fight cancer.
Cancers can be caused by genetic or environmental conditions, or a combination.【B11】______. That includes better diet, exercise and no smoking.
【B2】
选项
答案
Traditional
解析
转载请注明原文地址:https://kaotiyun.com/show/5sN7777K
0
大学英语四级
相关试题推荐
Inmanycountries,itisnot【B1】______forfamiliesofdifferent【B2】______tolivetogetherinsharedspace.However,intheUni
A、Atrainstation.B、Anairport.C、Abusstation.D、Asuperhighway.B
Whatmakesafullman?AccordingtoFrancisBacon,thecelebratedEnglishPhilosopher,theonlyfactorbywhicha"fullman"can
A、Contempt.B、Confidence.C、Jealousy.D、Anxiety.A此题也为词汇考查题。文中提到“’toholdupone’snose’expressesabasichumanfeeling-pride”,
A、Courteousandintellectual.B、Politeandmasculine.C、Braveandintelligent.D、Considerateandromantic.D此题涉及词汇的理解。文中提到“alar
A、Theprofessionoftheownerofthehouse.B、Thetypesofgameschildrenplayed.C、Thelocationofthehouse.D、Thesocialand
Istronglybelievethatitisratherimportanttobeagoodlistener.AndalthoughIhavebecomeabetterlistenerthanIwaste
AFewyearsago,Iwasaskedtoanswerthisquestiononaradioprogram,"Whatisthebiggestlessonyouhaveeverlearned?"
AFewyearsago,Iwasaskedtoanswerthisquestiononaradioprogram,"Whatisthebiggestlessonyouhaveeverlearned?"
A、Theweatherwasniceandtheseawascalm.B、Hewantedtohumorhischildren.C、Hewasinaverygoodmoodthatday.D、Thebab
随机试题
经上述处理后该妇女恶心、呕吐等症状于服药后的第3周缓解,始终坚持按医嘱服药,但在服用第二周期的第6片药后出现阴道少量出血,现已持续3天。采用上述处理后该妇女突破出血的症状缓解,希望把服用优思明作为长期避孕的方法。医生应告知患者服药期间出现下列哪些情况
物质代谢的各条途径不是孤立和分隔的,而是互相联系的。在代谢网络中,哪一条循环途径在整个代谢途径中处于中心的位置()。
A、虚寒B、痰湿C、肝火D、风热E、风寒早晨咳嗽加剧,咳嗽连声,声重浊,痰出咳减者多为
酸乳配制方法及注意事项,下列陈述哪项不妥:
有关建设项目“三同时”的主要内容中,试生产的报告内容说法正确的是()。
企业投资按范围不同可分为短期投资和长期投资。( )
人民检察院应当自接到公安机关提请逮捕后的( ),做出批准逮捕或不批准逮捕的决定。
下列叙述中,不符合m阶B-树定义要求的是()。
VBA中构成对象的三要素是( )。
CharacterAnalysisofShakespeareanPlaysI.Introduction—charactersare【T1】______ineveryplay【T1】______—conflictsusually
最新回复
(
0
)